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1 7- Selenabicyclo[2.2.1]heptane Phoebe E. Macdougall, a,b Heather M. Aitken, a,b Peter J. Scammells, a,c Yvonne Kavanagh, a,b Sara H. Kyne, a,b,d and Carl H. Schiesser* a,b Electronic Supplementary Information Details of computational methods employed, M05-2X/ G(d,p)-optimised geometry of 5 as Figure S1, Gaussian Archive Entries for 10 at all optimised levels of theory used; G3(MP2)-RAD calculated Arrhenius parameters for the cyclization of 9; experimental details for the preparation of 5; 1 H and 13 C NMR spectra of compounds 5, 11, 13, 14 (27 pages).
2 Computational Details Standard ab initio molecular orbital and DFT calculations were performed in Gaussian 09. S1 All geometry optimisations, frequency and single point energy calculations on open-shell species were performed using unrestricted wavefunctions. (U)RCCSD(T) calculations were performed using MOLPRO, version S2 Geometries of all species were optimised at the levels of theory listed in Table 1 and frequency calculations were also performed at these levels. Improved energies were then obtained using G3(MP2)-RAD, a high-level composite method that approximates (U)RCCSD(T) calculations with a large triple-ζ basis set via additivity corrections at the R(O)MP2 levelof theory. S3 This approach has been shown to reproduce a large test set of gasphase experimental data to within chemical accuracy, S3 and we have had success with the use of this method to model the kinetics and thermodynamics of radical cyclization reactions. S4,S5 Gas-phase rate coefficients were calculated using standard transition state theory as has previously been described by us. S5 References S1. Frisch, M. J.; Trucks, G. W.; Schlegel, H. B.; Scuseria, G. E.; Robb, M. A.; Cheeseman, J. R.; Scalmani, G.; Barone, V.; Mennucci, B.; Peterson, G. A.; Nakatsuji, H.; Caricato, M.; Li, X.; Hratchian, H.P.; Izmayl, A. F.; Bloino, J.; Zheng, G.; Sonnenberg, J. L.; Hada, M.; Ehara, M.; Toyota, K.; Fukuda, R.; Hasegawa, J.; Ishida, M.; Nakajima, T.; Honda, Y.; Kitao, O.; Nakai, H.; Vreven, T.; Montgomery, J. A. Jr.; Peralta, J. E.; Ogliaro, F.; Bearpark, M.; Heyd, J. J.; Brothers, E.; Kudin, K. N.; Staroverov, V. N.; Keith, T.; Kobayashi, R.; Normand, K.; Raghavachari, K.; Rendell, A.; Burant, J. C.; Iyengar, S.S.; Tomasi, J.; Cossi, M.; Rega, N.; Millam, J. M.; Klene, M.; Knox, J. E.; Cross, J. B.; Bakken, V.; Adamo, C.; Jaramillo, J.; Gomperts, R.; Stratmann, R.E.; Yazyev, O.; Austin, A. J.; Cammi, R.; Pomelli, C.; J. Ochterski, J.; Martin, R, L.; Morokuma, K.; Zakrzewski, V. G.; Voth, G. A.; Salvador, P.; Dannenberg, J. J.; Dapprich, S.; Daniels, A. D.; Farkas, O.; Foresman, J. B.; Ortiz, J. V.; Cioslowski, J.; Fox, D. J. GAUSSIAN 09 (Revision B.01), Gaussian, Inc., Wallingford, CT, S2. Werner, H.-J.; Knowles, P. J.; Lindh, R.; Manby, F. R.; Schu ẗz, M.; Celani, P.; Korona, T.; Rauhut, G.; Amos, R. D.; Bernhardsson, A.; Berning, A.; Cooper, D. L.; Deegan, M. J. O.; Dobbyn, A. J.; Eckert, F.; Hampel, C. Hetzer, G.; Lloyd, A. W.; McNicholas, S. J.; Meyer, W.; Mura, M. E.; Nicklass, A.; Palmieri, P.; Pitzer, R.; Schumann, U.; Stoll, H.; Stone, A. J.; Tarroni, R.; Thorsteins- son, T. MOLPRO, version , a package of ab initio programs. S3. D. J. Henry, M. B. Sullivan and L. Radom, J. Chem. Phys, 2003, 118, S4. S. Lobachevsky, C. H. Schiesser, C. Y. Lin and M. L. Coote, J. Phys. Chem. A, 2009, 112, S5. S. H. Kyne, C. Y. Lin, I. Ryu, M. L. Coote and C. H. Schiesser, Chem. Commun., 2010, 46, 6521.
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4 Gaussian Archive Entries Transition State 10: HF/6-311G(d,p) 1\1\GINC-MERRI012\FTS\UHF\6-311G(d,p)\C13H17Se1(2)\SHKYNE\11-Sep-2011\ 0\\# HF/6-311G** opt=(maxcyc=300,ts,noeigentest,readfc,nofreeze) freq geom=checkpoint guess=check\\cyclization to form selenabicyclo[2.1.1]h eptane - benzyl radical leaving group\\0,2\c, , , \Se, , , \C, , , \C, , , \ C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, , , \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S2= \S 2-1=0.\S2A= \RMSD=6.864e-09\RMSF=1.186e-06\Dipole= , , \Quadrupole= , , , , , \PG=C01 [X(C13H17Se1)]\\@ BHandHLYP/ G(d,p) 1\1\GINC-MERRI046\FTS\UBHandHLYP\ G(d,p)\C13H17Se1(2)\SHKYNE\13- Sep-2011\0\\# BHandHLYP/ G** opt=(maxcyc=300,ts,noeigentest,read fc,nofreeze) freq geom=checkpoint guess=check\\cyclization to form sel enabicyclo[2.1.1]heptane - benzyl radical leaving group\\0,2\c, , , \Se, , , \C, , , \C, , , \C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, , , \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S2= \S2-1=0.\S2A= \RMSD=7.409e-09\RMSF=6.8 05e-06\Dipole= , , \Quadrupole= , , , , , \PG=C01 [X(C13H17Se1)]\\@ BHandHLYP/aug-cc-pVDZ 1\1\GINC-MERRI022\FTS\UBHandHLYP\Aug-CC-pVDZ\C13H17Se1(2)\SHKYNE\14-Se p-2011\0\\# BHandHLYP/aug-cc-pVDZ opt=(maxcyc=300,ts,noeigentest,readf c,nofreeze) freq geom=checkpoint guess=check\\cyclization to form sele nabicyclo[2.1.1]heptane - benzyl radical leaving group\\0,2\c, , , \Se, , , \C, , , \C, ,
5 0761, \C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, , , \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S2= \S2-1=0.\S2A= \RMSD=7.292e-09\RMSF=3.629e-05\ Dipole= , , \Quadrupole= , , , , , \PG=C01 M05-2X/ G(d,p) 1\1\GINC-MERRI027\FTS\UM052X\ G(d,p)\C13H17Se1(2)\SHKYNE\24-Nov- 2011\0\\# M052X/ G** opt=(maxcyc=300,ts,noeigentest,readfc,nofre eze) freq geom=checkpoint guess=check\\cyclization to form selenabicyc lo[2.1.1]heptane - benzyl radical leaving group\\0,2\c, , , \Se, , , \C, , , \C, , , \C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, , , \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S 2= \S2-1=0.\S2A= \RMSD=9.610e-09\RMSF=6.530e-06\Dipole= , , \Quadrupole= , , , , , \PG=C01 [X(C13H17Se1)]\\@ M05-2X/aug-cc-pVDZ 1\1\GINC-MERRI052\FTS\UM052X\Aug-CC-pVDZ\C13H17Se1(2)\SHKYNE\30-Nov-20 11\0\\# M052X/aug-cc-pVDZ opt=(maxcyc=300,ts,noeigentest,readfc,nofree ze) freq geom=checkpoint guess=check\\cyclization to form selenabicycl o[2.1.1]heptane - benzyl radical leaving group\\0,2\c, , , \Se, , , \C, , , \C, , , \C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, ,
6 09762, \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S2= \S2-1=0.\S2A= \RMSD=8.402e-09\RMSF=5.742e-06\Dipol e= , , \quadrupole= , , , , , \PG=C01 M06-2X/ G(d,p) 1\1\GINC-MERRI026\FTS\UM062X\ G(d,p)\C13H17Se1(2)\SHKYNE\23-Nov- 2011\0\\# M062X/ G** opt=(maxcyc=300,ts,noeigentest,readfc,nofre eze) freq geom=checkpoint guess=check\\cyclization to form selenabicyc lo[2.1.1]heptane - benzyl radical leaving group\\0,2\c, , , \se, , , \c, , , \c, , , \C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, , , \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S2= \S2-1=0.\S2A= \RMSD=9.213e-09\RMSF=7.753e-06\Dip ole= , , \quadrupole= , , , , , \PG=C01 [X(C13H17Se1)]\\@ M06-2X/aug-cc-pVDZ 1\1\GINC-MERRI049\FTS\UM062X\Aug-CC-pVDZ\C13H17Se1(2)\SHKYNE\30-Nov-20 11\0\\# M062X/aug-cc-pVDZ opt=(maxcyc=300,ts,noeigentest,readfc,nofree ze) freq geom=checkpoint guess=check\\cyclization to form selenabicycl o[2.1.1]heptane - benzyl radical leaving group\\0,2\c, , , \se, , , \c, , , \C, , , \C, , , \C, , , \C, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \H, , , \C, , , \H, , , \H, , , \C, , , \C, , , \C, , , \C, , , \H, , , \C, , , \H, , , \C, , , \H, , , \H, , , \H, , , \\Version=AM64L-G09RevB.01\State=2-A\HF= \S2= \S2-1=0.\S2A= \RMSD=9.684e-09\RMSF=5.989e-06\ Dipole= , , \Quadrupole= , , , , , \PG=C01 [X(C13H17Se1)]\\@ ROMP2/ G(d,p)//BHandHLYP/ G(d,p) MP2= ROMP2/aug-cc-pVDZ//BHandHLYP/aug-cc-pVDZ MP2=
7 Calculated Arrhenius Data Experimental Details Experimental Procedure A: Ethyl 4-(methanesulfonyloxy)cyclohexanecarboxylate (13). A solution of ethyl 4-hydroxycyclohexanecarboxylate (0.95g, 5.54mmol), Et 3 N (1.16mL, 8.31mmol) in distilled DCM (27mL) was reduced to -20 C under a nitrogen atmosphere. Mesyl chloride (0.9mL, 11.64mmol) was added and the solution was maintained at this temperature for 1 hour. The reaction mixture was washed with 5% HCl x 2, 10% NaHCO 3 x 2 and saturated NaCl before being reduced in vacuo. The crude mesylate was purified by flash column chromatography (1:4 EtOAc:PS) to give the title compound as a clear oil and as a 2.2:1 mixture of isomers in a yield of 1.31g, (94%). 1 H-NMR (CDCl 3 ): δ (m, 3H), (m, 9H), 3.02 (s, 3H), 4.12 (q, J = 7.2, 14.4Hz, 2H), 4.64 (major, quin, J = 5.2, 6Hz, 1H) 4.92 (minor, m, 1H). 13 C-NMR (CDCl 3 ): δ (major), (minor), (minor), (major), (minor), (major), (minor), (minor), (minor), (major), (minor), (major), (minor), (major), (major), (minor). MS (ESI): 273 ([M + Na] + ). Experimental Procedure B: Ethyl 4-(4-methoxybenzylseleno)cyclohexanecarboxylate To a solution of bis(4-methoxybenzyl) selenide (4.03g, 10.06mmol) in distilled EtOH (183mL) maintained at 0 C under a nitrogen atmosphere, was added NaBH 4 (~1.00g) until the solution remained colourless. The solution was stirred for a further 30 mins before ethyl 4- (methanesulfonyloxy)cyclohexanecarboxylate (1.26g, 5.03mmol) in distilled EtOH (10mL)
8 was added dropwise. The mixture was refluxed overnight after which it was cooled and the solvent removed in vacuo. The product was taken up in H 2 O, extracted into Et 2 O x 2, dried over MgSO 4 and the solvent evaporated. The crude benzylselenide was purified by flash column chromatography (1:80 EtOAc:PS) to give the title compound as a yellow oil and as a mixture of isomers in a yield of 1.03g (60%). 13 C-NMR (CDCl 3 ): δ (minor), 14.12, (minor), 25.97, 26.11, 29.60, (minor), 31.11, 33.30, (minor), 37.75, 41.33, (minor), 55.09, 60.04, , , , , (minor), , , Se-NMR (CDCl 3 ): δ MS (ESI): 463 ([M + Ag] + ). HRMS calcd for C 17 H 24 AgO 3 Se [M + Ag] , found A small quantity was further purified by flash chromatography to afford samples of each isomer. 1 H-NMR (CDCl 3 ) major isomer: δ (m, 3H), (m, 2H), (m, 4H), (m, 2H), 2.35 (p, J = 4.5, 8.5Hz, 1H), 3.06 (t, J = 5Hz, 1H), 3.73 (s, 2H), 3.76 (s, 3H), 4.11 (q, J = 7.5, 14.5Hz, 2H), 6.80 (dd, J = 3, 9.5Hz, 2H), 7.19 (dd, J = 2, 6.5Hz, 2H). 1 H-NMR (CDCl 3 ): minor isomer: δ (m, 3H), (m, 2H), (m, 2H), (m, 2H), (m, 2H), (m, 1H), 3.74 (s, 2H), 3.77 (s, 3H), 4.12 (q, J = 8, 15.2Hz, 2H), 6.79 (dd, J = 2, 6.8Hz, 2H), 7.18 (dd, J = 2, 6.4Hz, 2H). Ethyl 4-(benzylseleno)cyclohexanecarboxylate The title compound was prepared from ethyl 4-(methanesulfonyloxy)cyclohexanecarboxylate (13) and dibenzyl diselenide according to Experimental Procedure B as a yellow oil in 53% yield. 1 H-NMR (CDCl 3 ): δ (m, 3H), (m, 2H), (m, 4H), (m, 2H), 2.34 (sep, J = 5, 10.5, 16Hz, 1H), 3.05 (quin, J = 6.5, 13Hz, 1H), 3.74 (t, J = 7.5Hz, 2H), 4.10 (q, J = 8.5, 17.5Hz, 2H), (m, 1H), (m, 3H). 13 C-NMR (CDCl 3 ): δ 14.04, 25.99, 26.40, 29.47, 30.95, 33.16, 37.72, 41.17, 59.93, , , , , , , Se-NMR (CDCl 3 ): δ MS (ESI): 349 ([M + Na] + ). HRMS calcd for C 16 H 22 NaO 2 Se [M + Na] , found Experimental Procedure C: 4-(4-Methoxybenzylseleno)cyclohexanecarboxylic acid To a round bottom flask, under a nitrogen atmosphere, fitted with a condenser and drying tube was added ethyl 4-(4-methoxybenzylseleno)cyclohexanecarboxylate (1.06g, 2.99mmol) and distilled EtOH (4.3mL). The reaction mixture was heated to ~65 C after which a solution of KOH (0.20g, 3.58mmol) in EtOH (4.3mL) was added dropwise. The mixture was heated for a further 4 hours, cooled and the solvent removed in vacuo. The residue was acidified with 5% HCl, extracted into Et 2 O x 3, dried over MgSO 4 and evaporated. The crude acid was then purified by flash column chromatography (1:10 EtOAc:PS) to give the title compound as a pale oil and as a 2.4:1 mixture of isomers in a yield of 0.65g, (66%). 1 H-NMR (CDCl 3 ): δ (m, 1H), (m, 7H), (minor, m, 1H), 2.44 (major, sep, J = 4, 8.5, 12.5Hz, 1H), (minor, m, 1H), 3.07 (major, quin, J = 5, 10Hz, 1H), 3.75 (s, 2H), 3.79 (d, J = 1.5Hz, 3H), 6.82 (dd, J = 2.5, 6Hz, 2H), 7.21 (dd, J = 1.5, 6.5Hz, 2H), (bs, 1H). 13 C-NMR (CDCl 3 ): major δ (minor), 25.99, 26.10, 29.43, 31.08, 33.25, (minor), 37.62, (minor), 42.15, 55.24, , , , , (minor), , , MS (ESI): 435 ([M + Ag] + ). HRMS calcd for C 15 H 20 AgO 3 Se [M + Ag] , found
9 4-(Benzylseleno)cyclohexanecarboxylic acid The title compound was prepared from ethyl 4-(benzylseleno)cyclohexanecarboxylate according to Experimental Procedure C as a pale oil and as a 2.3:1 mixture of isomers in 82% yield. 1 H-NMR (CDCl 3 ): δ (m, 1H), (m, 7H), (minor, m, 1H), (major, m, 1H), (minor, m, 1H), (major, m, 1H), (m, 3H), (m, 4H), (bs, 1H). 13 C-NMR (CDCl 3 ): major δ 25.84, (minor), 26.52, 29.27, 30.91, 33.09, (minor), 37.60, 40.99, 42.06, , (minor), , (minor), , , (minor), , , (minor). 77 Se-NMR (CDCl 3 ): δ MS (ESI): 321 ([M + Na] + ). HRMS calcd for C 14 H 18 NaO 2 Se [M + Na] , found Experimental Procedure D: N-[4-p-(Methoxybenzyl)selenocyclohexanoyl]-N,S-dimethyldithiocarbamate (14) To a solution of 4-(4-methoxybenzylseleno)cyclohexanecarboxylic acid (0.65g, 1.98mmol), DCC (0.62g, 2.96mmol), DMAP (48.3mg, 0.40mmol) and distilled DCM (5mL) was added N,S-dimethl-N-hydroxydithiocarbamate (0.41g, 2.96mmol) in distilled DCM (1.2mL) dropwise. The reaction mixture was stirred overnight at room temperature after which it was filtered through celite. The filtrate was washed with saturated NaHCO 3 x 2, dried over Na 2 SO 4 and the solvent removed in vacuo. The crude dithiocarbamate was purified by flash column chromatography (1:40 EtOAc:PS) to give the title compound as a clear oil and as a mixture of isomers in a yield of 0.78g, (88%). 77 Se-NMR (CDCl 3 ): δ 329. MS (ESI): 554 ([M + Ag] + ). HRMS calcd for C 18 H 25 AgNO 3 S 2 Se [M + Ag] , found A small quantity was further purified by flash chromatography to a small sample of each isomer. Major isomer: 1 H-NMR (CDCl 3 ): δ (m, 6H), (m, 2H), 2.54 (s, 3H), (m, 1H), 3.10 (bs, 1H), 3.77 (d, J = 5Hz, 8H), 6.82 (dd, J = 2, 6.5Hz, 2H), 7.21 (dd, J = 2.5, 6.5Hz, 2H). 13 C-NMR (CDCl 3 ): δ 18.41, 25.55, 26.07, 30.71, 36.92, 39.43, 42.43, 55.00, , , , , , Minor isomer: 1 H-NMR (CDCl 3 ): δ (m, 4H), (m, 4H), (m, 4H), (m, 1H), (m, 8H), 6.79 (dd, J = 2, 6.5Hz, 2H), 7.18 (dd, J = 2, 6.5Hz, 2H). 13 C-NMR (CDCl 3 ): δ 18.54, 25.59, 29.17, 32.93, 36.18, 40.23, 42.54, 55.15, , , , , , N-[4-p-(Benzylseleno)cyclohexanoyl]-N,S-dimethyldithiocarbamate (11) The title compound was prepared from 4-(benzylseleno)cyclohexanecarboxylic acid according to Experimental Procedure D as a pale oil and as a 1.7:1 mixture of isomers in 82% yield. 77 Se-NMR (CDCl 3 ): δ 327. MS (ESI): 524 ([M + Ag] + ). HRMS calcd for C 17 H 23 AgNO 2 S 2 Se [M + Ag] , found A small quantity was further purified by flash chromatography to a small sample of each isomer.
10 Major isomer: 1 H-NMR (CDCl 3 ): δ (m, 6H), (m, 2H), 2.56 (s, 3H), 2.65 (quin, J = 5, 9Hz, 1H), 3.15 (bs, 1H), (m, 5H), (m, 1H), (m, 4H). 13 C-NMR (CDCl 3 ): δ 18.50, 25.60, 26.69, 29.51, 30.74, 37.09, 39.49, 42.53, , , , , , Minor isomer: 1 H-NMR (CDCl 3 ): minor δ (m, 4H), (m, 4H), 2.53 (s, 3H), (m, 1H), 3.74 (s, 3H), 3.83 (s, 2H), (m, 1H), (m, 4H). 13 C-NMR (CDCl 3 ): minor δ 18.47, 26.06, 29.06, 29.49, 32.84, 36.26, 40.13, 42.46, , , , , , Experimental Procedure E: 7-Selenabicyclo[2.2.1]heptane (5) A solution of N-[4-p-(methoxybenzyl)seleno)cyclohexanoyl]-N,S-dimethyldithiocarbamate (0.26g, 0.58mmol) and benzene (5.8mL) was placed in a sealed tube and heated at ~200 C overnight. The solvent was removed in vacuo at room temperature to give the crude bicycle which was purified by flash column chromatography (distilled pentane) to give the title compound in a yield of 18.1mg, (20 %). 1 H-NMR (CDCl 3 ): δ 1.75 (d, J = 5.5Hz, 4H), 1.95 (d, J = 8Hz, 4H), 4.29 (s, 2H). 13 C-NMR (CDCl 3 ): δ 35.59, Se-NMR (CDCl 3 ): δ 389. MS (ESI): 177 ([M + CH 3 ] + ). HRMS calcd for C 7 H 13 Se [M + CH 3 ] , found
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Structural Expression of Exo-Anomeric Effect
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