Asymmetric Synthesis of, 2Disubstituted 2Lactones

Transcript

1 , ACTA CHIMICA SINICA Vol 62, 2004 No 18, , 2 2 ΞΞ ( ) ( S)2, 2 (3 R,4 S)2blastmycinone, 2 whisky 2 ( S)2,blastmycinolactone, 2whisky,,, N, O2 Asymmetric Synthesis of, 2isubstituted 2Lactones HUANG, Pei2Qiang Ξ YU, Xian2Yong LIU, Xiu2Ping ( epartment of Chemistry, Fujian Province Key Laboratory of Chemical Biology, Xiamen University, Xiamen ) Abstract A flexible approach to 2alkyl 2htdroxy 2lactone is described Tow of the lactones were converted into blastmycinone and trans2whisky lactone respectively The method features a NaBH4 mediated reductive ring2opening of N, O2acetals, which is obtained via a regioselective Grignard reagent addition with ( S ) 2N, O2dibenzylmalimide followed by lactoneization The flexibility of the method allows the introduction of various 2alkyl side chains by Grignard reagents addition Keywords ( S)2malic acid, blastmycinone, trans2whisky lactone, reduction, Grignard reagent, N, O2acetal, 4, 7, 8), 2 [6g 2,8],NFX22 (1a) NFX24 (1b) NF218 blastmycinone trans2whisky Virginiamycin [1] Blastmycinolactol (2) NFX22 NFX24, (3) [2] A (anitimycin A),, 1 ( - )2 1 1 Litsenolide B 1, B 2, C 1, C 2 ( 4a 4d) [3] Lirsea japonica Yanaco MP500, ; Nicholet,, 2 2, Avatar Fourier ; Varian + 500, 2 2, (TMS,CCl 3, ) ; Finnigan MPT2 trans2whisky (5) [4] 2cognac GCQ LCQ, ;Bruker APEX2 FTMS (6), m/ z ( % rel int) ; Perkin2, 7 Elmer 341 MC A R 8 [5] 2 9, [9,10] [6,7] 1 2 N, O2 ( 10) - [9, 2 2 (1 10a, -,,10] 10a Ξ E2mail edu cn Received April 1, 2004 ; revised and accepted August 15, 2004 (Nos ; )

2 No 18 :, (311 mg, 1 0 mmol) EtOH (5 ml) NaBH 4 (148 mg, 3 0 mmol), 10 min, 2H, PhCH 2 42H), (complex, 5H, Ph2H) - 2 ml, (10 ml 3) J 2 = 6192 Hz, 1H, 22H), (m, 1H, 32H), 4140, ( 4 45 (m, 1H, 42H), 4151 ( d, J = Hz, 1H, PhCH 2 ),,EtOAc PE 1 3, 1 2, 1 1) 20a h 125 mg 20a l : [ ] ( c 019, CH 2 Cl 2 ) IR (film) max : 2933, 1780, 1455, 1340, 1165, 1067 cm H NMR ( 500 MHz, CCl 3 ) : 1147 (d, J = 6162 Hz, 3H, CH 3 ), 2165 (dd, J 1 = Hz, J 2 = 4196 Hz, 1H, 22H), 2 69 (dd, J 1 = Hz, J 2 = 3115 Hz, 1H, 22H), ( m, 1H, 32H), 4160 ( d, J = 1210 Hz, 1H, PhCH 2 ), (complex, TLC,3 h - MS ( ESI) m/ z : 229 (M + Na +, 100), 189 (M + - OH, 22), 2 ml 5 min, 147 ( 40 ) HRMS ( ESI) m/ z : C 12 H 14 O 3 + Na +, : (10 ml 3), , : Anal calcd for C 12 H 14 O 3 : C ( EtOAc PE 1 2, 1 1) 69188, H 6184 ; found C 69161, H a 266 mg, 114 ( 3 S, 4 R) ( 20b h) 85 % ( 3 S,4 S) ( 20b l) 13 ( 3 S, 4 R) ( 20a h) 402 mg 10b, 20b h 123 mg, 20b ( 3 S,4 S) ( 20a l) l 128 mg, 93 % 19a (460 mg, 1 47 mmol) 20b h : IR (film) max : 2924, 2853, 1780, 1457, 1376, (5 ml), 10 min 3 mol/ L 1170 cm H NMR (500 MHz, CCl 3 ) : 110 (t, J = ml, 5 min h, Hz, 3H, CH 3 ), (m, 2H, CH 2 ), 2160 (dd, J 1 = Hz, J 2 = 3161 Hz, 1H, 22H), 2172 (dd, J 1 = Hz, 4156 (d, J = Hz, 1H, PhCH 2 ), (complex, 20a l 125 mg, 82 % 20a h : [ ] ( c 017, CH 2 Cl 2 ) IR (film) 5H, Ph2H) MS ( EI) m/ z : 220 (M +, 32), 173 (18), 116 max : 2980, 2932, 1780, 1360, 1173, 1107, 1073, 1028 cm - 1 (28), 105 ( 36), 91 (Bn +, 100), 65 ( C H 5 H 5 +, 22) HRMS NMR (500 MHz, CCl 3 ) : 1138 (d, J = 6177 Hz, 3H, CH 3 ), (ESI) m/ z : C 13 H 16 O 3 + Na +, : , : 2160 (dd, J 1 = Hz, J 2 = 3191 Hz, 1H, 22H), 2178 (dd, J 1 = Hz, J 2 = 6177 Hz, 1H, 22H), (m, 1H, b l : IR (film) max : 2925, 1777, 1455, 1346, 1168, 32H), 4152 ( d, J = Hz, 1H, PhCH 2 ), 4156 ( d, J = 1143 cm H NMR (500 MHz, CCl 3 ) : 1101 (t, J = Hz, 1H, PhCH 2 ), 4161 ( dq, J 1 = 3116 Hz, J 2 = 6177 Hz, 1H, 42H), (complex, 5H, Ph2H) MS ( ESI) Hz, 3H, CH 3 ), (m, 1H, (1/ 2) CH 2 ), (m, 1H, (1/ 2) CH 2 ), 2164 (dd, J 1 = Hz, J 2 = 5127 Hz, m/ z : 229 (M + Na +, 100), 189 (M + - OH, 18), 147 (18) 1H, 22H), 2172 (dd, J 1 = Hz, J 2 = 119 Hz, 1H, 22H), HRMS ( ESI) : C 12 H 14 O 3 + Na +, : ; : (m, 1H, 32H), (m, 1H, 42H), Anal calcd for C 12 H 14 O 3 : C 69188, H 6184 ; found C (d, J = Hz, 1H, PhCH 2 ), 4161 (d, J = Hz, 1H, ; H 6183 PhCH 2 ), (complex, 5H, Ph2H) MS ( EI) m/ z : 220 (M +, 24), 173 (18), 116 (24), 105 (22), 91 (Bn +, 100), 65 (C 5 H + 5, 18) HRMS ( ESI) : C 13 H 16 O 3 + Na +, : , : ( 3 S,4 R) ( 20c h) ( 3 S,4 S) ( 20c l)

3 1796 Vol 62, mg 10c, 20c h 92 mg, 20c l 112 mg, 90 % 20c h : [ ] ( c 111, CHCl 3 ) IR (film) max : 2957, 2930, 2871, 1779, 1445, 1346, 1204, 1165, 1093, 1027 cm H NMR (500 MHz, CCl 3 ) : 0191 (t, J = 7107 Hz, 3H, CH 3 ), (complex, 4H, 2 CH 2 ), (complex, 2H, CH 2 ), 2160 (dd, J 1 = Hz, J 2 = 3184 Hz, 1H, 22H), 2176 ( dd, J 1 = Hz, J 2 = 3 77 Hz, 1H, 22 H), (m, 1H, 32H), (m, 1H, 42H), 4152 (d, J = Hz, 1H, PhCH 2 ), 4156 (d, J = Hz, 1H, PhCH 2 ), ( complex, 5H, Ph2H) MS ( ESI) m/ z : 251 (M + + 2H, 17), 250 (M + + H, 18), 232 (15), 209 (M + - C 3 H 3, 8), 198 (8), 174 (10), 136 (15), 91 (Bn +, 100) HRMS ( ESI) m/ z : C 15 H 20 O 3 + Na +, : , : Anal calcd for C 15 H 20 O 3 : C 72155, H 8112 ; found 72144, H c l :[ ] ( c 111, CHCl 3 ) IR (film) max : 2958, 2930, 2868, 1778, 1460, 1432, 1204, 1093 cm H NMR (500 MHz, CCl 3 ) : 0184 (t, J = 7105 Hz, 3H, CH 3 ), (complex, 4H, 2 CH 2 ), (complex, 1H, (1/ 2) CH 2 ), ( complex, 1H, ( 1/ 2) CH 2 ), 2158 (dd, J 1 = Hz, J 2 = 4189 Hz, 1H, 22H), 2164 (dd, J 1 = Hz, J 2 = 1195 Hz, 1H, 22H), (m, 1H, 32 H), (m, 2H, PhCH 2, 42H), 4156 (d, J = Hz, 1H, PhCH 2 ), ( complex, 5H, Ph2H) MS ( ESI) : 251 (M + + 3H, 75), 250 (M + + H, 100), 230 (M + - H 2 O, 65), 230 (40), 182 (M + + 2H - C 5 H 5 ), 176 (15), 159 (M + + H - Bn, 20), 9112 (Bn +, 85) HRMS ( ESI) m/ z : C 15 H 20 O 3 + Na +, : , : ( 3 S,4 R) ( 20d h) ( 3 S,4 S) ( 20d l) 369 mg 10d, 20d h 103 mg, 20d l 147 mg, 93 % 20d h : 1 H NMR (500 MHz, CCl 3 ) : 0188 (t, J = 6192 Hz, 3H, CH 3 ), (m, 8H,4 CH 2 ), [ m, 1H, (1/ 2) H], [ m, 1H, (1/ 2) CH 2 ], (m, 2H, CH 2 ), 2160 (dd, J 1 = Hz, J 2 = 3169 Hz, 1H, 22H), 2176 (dd, J 1 = Hz, J 2 = 6177 Hz, 1H, 22H), (m, 1H, 32H), (m, 1H, 42H), 4151 (d, J = Hz, 1H, PhCH 2 ), 4155 (d, J = Hz, 1H, PhCH 2 ), (complex, 5H, Ph2H) 1 20d l : 1 H NMR (500 MHz, CCl 3 ) : 0188 (t, J = 6184 Hz, 3H, CH 3 ), (m, 9H, CH 2), [m, 1H, (1/ 2) CH 2 ], [ m, 1H, (1/ 2) CH 2 ], [ m, 1H, (1/ 2) CH 2 ], 2162 (dd, J 1 = 17154, J 2 = 5138 Hz, 1H, 22H), 2170 (dd, J 1 = Hz, J 2 = 1153 Hz, 1H, 22H), (m, 1H, 32H), (m, 1H, 42 H), 4142 (d, J = Hz, 1H, PhCH 2 ), 4162 (d, J = Hz, 1H, PhCH 2 ), (complex, 5H, Ph2H) ( 3 S,4 R) ( 21a) 340 mg 20a h (1165 mmol) 165 mg Pd/ C (10 %) 10 ml EtOH, H 2,5 d,, ( EtOAc PE = 1 1, 2 1, 3 1) 21a 182 mg, 95 % [ ] ( c 114, CHCl 3 ) IR (film) max : 3431, 2982, 2934, 1773, 1187, 1054, 1028 cm H NMR (500 MHz, CCl 3 ) : 1138 (d, J = 6161 Hz, 3H, CH 3 ), 2152 (dd, J 1 = Hz, J 2 = 3185 Hz, 1H, 22H), 2186 (dd, J 1 = Hz, J 2 = 6153 Hz, 1H, 22H), (m, 1H, 32H), 4153 ( dq, J 1 = 6192 Hz, J 2 = 6 61 Hz, 1H, 42H) 13 C NMR ( 125 MHz, CCl 3 ) : , 84146, 72151, 37122, MS ( ESI) m/ z : 117 (M + + H, 100), 96 (30), 88 (10), 74 (10), 74 (20) HRMS ( ESI) m/ z : C 5 H 8 O 3 + Na +, : , : Anal calcd for C 5 H 8 O 3 : C 51172, H 6194 ; found C 51153, H ( 3 S,4 S) ( 22a) 100 mg 20a l, 22a 49 mg,, 88 % [ ] ( c 110, EtOH) IR (film) max : 3428, 2935, 1770, 1172, 1057 cm H NMR (500 MHz, CCl 3 ) : 1138 (d, J = 6162 Hz, 3H, CH 3 ), 2112 ( bs, 1H, OH), 2151 ( d, J = Hz, 1H, 22H), 2175 ( dd, J 1 = Hz, J 2 = 5164 Hz, 1H, 22H), (m, 1H, 32 H), 4152 ( dq, J 1 = 3176 Hz, J 2 = 6162 Hz, 1H, 42H) 13 C NMR ( 125 MHz, CCl 3 ) : , 81133, 69126, 39134, MS ( ESI) m/ z : 119 (M + + 2H, 70), 118 (M + + H, 30), 105 (100), 96 (45), 95 (47), 87 (43), 74 (10), 73 (45), 65 (14) HRMS ( ESI) m/ z : C 5 H 8 O 3 + Na +, : , : Anal calcd for C 5 H 8 O 3 : C 51172, H, 6194 ; found C 51126, H ( 3 S,4 R) ( 21b) 123 mg 20b h, 21b 63 mg,, 87 % IR (film) max : 3423, 2970, 2942, 2847, 1770, 1470, 1362, 1190, 1102, 1059, 1013, 973 cm H NMR ( 500 MHz, CCl 3 ) : 1104 ( t, J = 7137 Hz, 3H, CH 3 ), (complex, 2H, CH 2 ), (s, 1H, OH), 2 54 ( dd, J 1 = Hz, J 2 = 3 61 Hz, 1H, 22H), 2183 (dd, J 1 = Hz, J 2 = 6 37 Hz, 1H, 22H), (m, 2H, 42H) 13 C NMR (125 MHz, CCl 3 ) : , 88 88, 71 34, 37 73, 26 17, 9 57 MS ( ESI) m/ z : 131 (M + + H, 100), 113 (30), 96 (30), 84 (8), 74 (25) HRMS ( ESI) m/ z : 2 C 6 H 10 O 3 + Na +, : , : ( 3 S,4 S) ( 22b) 128 mg 20b l, 22b 62 mg,, 83 % [ ] ( c 1 1, CHCl 3 ) IR (film) max :

4 No 18 :, , 2973, 2938, 2883, 1761, 1173, 1075, 961 cm - 1 NMR (500 MHz, CCl 3 ) : 1 07 (t, J = 7 46, 3H, CH 3 ), (complex, 2H, CH 2 ), 2 56 (d, J = 17 83, 1H, 22 H), 2 81 (dd, J 1 = Hz, J 2 = 5 46 Hz, 2H, 22H), (m, 1H, 32H), (m, 1H, 42H) 1 H 13 C NMR (125 MHz, CCl 3 ) : , 86 28, 68 67, 39 49, 21 44, 9 85 MS ( ESI) m/ z : 131 (M + + H, 100), (28), 96 2 (55), 74 4 (30) HRMS : 2C 6 H 8 O 3 + Na +, : , : ( 3 S,4 R) ( 21c) 84 mg 20c, 21c 46 mg, CH 2 ), 2155 ( d, J = Hz, 1H, 22H), 2180 ( dd, J 1 =, 87 % [ ] ( c 112, CHCl 3 ) IR (film) max : Hz, J 2 = 5145 Hz, 1H, 22H), (m, 1H, , 2958, 2932, 2862, 1771, 1187, 1052, 987 cm - 1 NMR (500 MHz, CCl 3 ) : 0192 (t, J = 7115 Hz, 3H, CH 3 ), (complex, 6H, 3 CH 2 ), ( bs, 1H, OH), 2152 ( dd, J 1 = 17198, Hz, J 2 = 3169 Hz, 1H, 22H), 2184 (dd, J = 17198, 6161 Hz, 1H, 22H), (m, 1H, 32H), (m, 1H, 42H) 1 13 C NMR (125 MHz, CCl 3 ) : , 87177, 71175, 37166, 32177, 27123, 22133, MS ( ESI) m/ z : 181 (M + Na +, 100), 159 (M + + H, 10), 141 (M - OH +, 15) HRMS ( ESI) m/ z : C 8 H 14 O 3 + Na +, : , : ( 3 S,4 S) ( 22c) 1 H 71 mg 20c l, 22c 39 mg, TLC, KMnO 4,,, 86 % [ ] ( c 111, CHCl 3 ) IR (film) max : 3434, 2958, 2931, 1761, 1203, 1169, 1140, 1081, 1071 cm H NMR (500 MHz, CCl 3 ) : 0194 (t, J = 6199 Hz, 3H, CH 3 ), (complex, 6H, 3 CH 2 ), 210 (bs, 1H, OH), 2156 (d, J = Hz, 1H, 22H), 2180 (dd, J 1 = Hz, J 2 = 5138 Hz, 1H, 22H), (m, 1H, 32 H), (m, 1H, 42H) 13 C NMR (125 MHz, CCl 3 ) : , 84178, 69106, 33145, 27194, 27165, 22153, MS ( ESI) m/ z : 181 (M + Na +, 100), 159 (M + + H, 8), 141 (M + - OH, 30) HRMS ( ESI) m/ z : C 8 H 14 O 3 + Na +, : , : Anal calcd for C 8 H 14 2 O 3, C 60174, H 8192 ; found C 60154, H ( 3 S,4 R) ( 21d) (dd, J 1 = 5176 Hz, J 2 = 1134 Hz, 1H, 22H) 13 C NMR ( mg 20d h, 21d 60 mg, MHz, CCl 3 ) : , , , 83143, 32183,, 86 % [ ] ( c 110, CHCl 3 ) IR (film) max : 3426, 2955, 2927, 2856, 1770, 1186 cm H NMR (500 MHz, CCl 3 ) : 0189 (t, J = 6192 Hz, 3H, CH 3 ), (complex, 8H, 4 CH 2 ), [ m, 1H, (1/ 2) CH 2 ], [ m, 1H, (1/ 2) H 2 ] (m, 2H, CH 2 ), 2153 ( dd, J 1 = Hz, J 2 = 3177 Hz, 1H, 22H), 2185 (dd, J 1 = Hz, J 2 = 6 61 Hz, 1H, 2 - H), (m,1h, 32H), ( m, 1H, 42H) 13 C NMR (125 MHz, CCl 3 ) : , 87174, 71173, 37166, 33110, 31168, 29119, 29104, 25120, 22158, MS ( ESI) m/ z : 223 (M + Na +, 100), 201 (M + + H, 20), 183 (M + - OH, 16), 165 (15), 123 (22) HRMS ( ESI) m/ z : C 11 H 20 O 3 + Na +, : , : ( 3 S,4 S) ( 22d) 110 mg 20d l, 22d 60 mg,, 84 % [ ] ( c 111, CHCl 3 ) IR (film) max : 3460, 2953, 2923, 2855, 1743, 1465, 1238, 972 cm - 1 NMR (500 MHz, CCl 3 ) : 0190 (t, J = 618 Hz, 3H, CH 3 ), (complex, 8H, 4 CH 2 ), [ m, 1H, (1/ 2) H 2 ] ( m, 1H, CH 2 ), ( m, 2H, H), (m, 1H, 42H) 1 H 13 C NMR (125 MHz, CCl 3 ) : , 84166, 69112, 39145, 31173, 29142, 29109, 28126, 25154, 22161, MS ( ESI) m/ z : 223 (M + Na +, 100), 201 (M + + H, 13), 183 (M + - OH, 25), 165 (22), 123 (10) HRMS ( ESI) m/ z : C 11 H 20 O 3 + Na +, : , : ( R) ( 5 H)2 ( 23) N 2 21c (23 mg, mmol) CH 2 Cl 2 (1 ml), Et 3 N (01061 ml, 44 mg, mmol), - 5 min, MsCl ml (33 mg, mmol) 4 min, -,1 h 30 min, 25 ml CH 2 Cl 2,215 mol/ L HCl, NaCl,, ( EtOAc PE 1 3, 1 2, 1 1) mg, 8813 % [ ] ( c 1128, CHCl 3 ) { [7a] : [ ] ( c 1138, CHCl 3 ) ; [7g] : [ ] ( CHCl 3 ) ; [7h] : [ ] (CHCl 3 ) } IR (film) max : 3495, 3088, 2958, 2927, 2861, 1751, 1465, 1162, 1097, 1025 cm H NMR ( 500 MHz, CCl 3 ) : 0180 ( t, J = 7107 Hz, 3H, CH 3 ), (complex, 4H, 2 CH 2 ), (complex, 1H, CH 2 ), (complex, 1H, CH 2 ), (complex, 1H, 42H), 6104 (dd, J 1 = 5176 Hz, J 2 = 1198 Hz, 1H, 32H), , 22138, MS ( ESI) m/ z : 163 (M + Na +, 100), 141 (M + + H, 80) HRMS ( ESI) m/ z : 2C 8 H 12 O 2 + Na +, : , : ( + )2Blastmycinolactol 2 ( - )2Blastmycinone 3 [6],21a ( + )2blastmycinolactol 2 {m p : ; [ ] ( c 018, CHCl 3 ) ( ) [6h] : m p ; [ ] ( c 1195, CHCl 3 ) ; [6k] : m p ; [ ] ( c 1109, MeOH) ; ( ) [6e] :[ ] ( c 0163, MeOH) ; ( ) [6i ] : [ ] ( c

5 1798 Vol 62, , MeOH) } ( - )2blastmycinone (3) {[ ] ( c 016, CHCl 3 ) [6h] : [ ] ( c 1170, CHCl 3 ) ; ( ) [6k] : [ ] ( c 1120, CHCl 3 ) ; ( ) [6d] : [ ] ( c 1118, CHCl 3 ) } ( - )2Blastmycinolactone 2 [9 ( - )2blastmycinone 3,,10] ( 3) 10a ( ) (R = Me) NaBH 4 ( EtOH, r t, h) 2 N, O2, ( S)2 blastmycinone N, O2 9 22C 19a, 19a HCl, h, 20a 80 % 84 % 20a, 2 1 ( 3 S,4 S/ R) NaBH N, O2 9 NaBH 4 / ROH NaBH 4 - n (OR) n, (15), [9] NaBH 4 - (10 19), (MeOH, i2proh, t2buoh), [10] ( 1), (45 55) Yoda [11] C 2, LiBH 4 IBAL2H - N, O2 Yoda (, - 2 [12] N, O2 ) NaBH 4 - (82 18 NaBH 4 N, O ) [12], ( 2) NaBH 4 Scheme 1 Scheme 2 Scheme 3

6 No 18 :, R 1 (3 S,4 S/ R) Table 1 Synthesis of (3 S,4 S/ R)232hydroxy242alkyl2 2lactones 1 Me 10a ( 90) 19a ( 85) 20a ( 82) 21a ( 95) 22a ( 88) 50 2 Et 10b ( 86) 19b ( 85) 20b ( 93) 21b ( 87) 22b ( 83) n2bu 10c ( 90) 19c ( 84) 20c ( 90) 21c ( 87) 22c ( 86) n2c 7 H 15 10d ( 85) 19d ( 80) 20d ( 93) 21d ( 86) 22d ( 84) Scheme 4 Scheme 5,20a ( - )2litsenolides B 1, B 2, C 1, C 2 (4a 4d) [6j ],, ( - )221a 21a {[ ] ( c 1 4, CHCl 3 ) ; ( - )2litsenolides B1, B 2, C 1, C 2 (4a 4d) [6j ] :[ ] ( c 2 42, CHCl 3 ), [6e] : [ ] ( c 1 27, CHCl 3 ) } 22a {[ ] ( c 1 0, Et2 OH) ; [6e] :[ ] ( c 2 94, EtOH), [6g] : [ ] ( c 1 60, EtOH) } 9, 3, 21c 0, 21b d 22b d,nabh h, - 23, [ ] ( 1) 2 2 ( - )2Blastmycinone 2whisky CHCl 3 ) ; [7g] : [ ] (CHCl 3 ), 88 % 23 21a 2whisky (5) [7a,7g,7h], 23 ( + )2blastmycinolactol 2 ( 4) {m p : 49 2whisky (5) 50 ; [ ] ( c 018, CHCl 3 ) [6h] : [ ] ( c 1195, CHCl 3 ) ; ( ) [6k] : m p ; [ ] ( c 1109, MeOH) ; ( ) [6e] : [ ] ( c 0163, MeOH) ; ( ) [6i ] : [ ] ( c 116, MeOH) } ( - )2blastmycinone 3 {[ ] ( c 016, CHCl 3 ) [6h] : [ ] ( c 1170, CHCl 3 ) ; ( ) [6k] : [ ] ( c 1120, CHCl 3 ) ; ( NaBH 4 N, O2 - ) [6d] : [ ] ( c 1118, CHCl 3 ) } 1 ( + )2 Blastmycinolactone 2 ( - )2blastmycinone 3, (1,2 5 8), ( - )221a, ( - )222a - ( - )27 ( - )28 [6f ],, ( - )222a ( - )27 ( - ) ( c 0128, CHCl 3 ) [7a] : [ ] ( c 1138, 3-98 ( CHCl 3 ) ; [7h] : [ ] 20 N, O2 9, 2, 2,,,,,,

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