Synthetic Studies of Amphotericin B. II. A Facile Synthesis of the C-1–C-12 Segments of the Amphotericin B Aglycon
作者:Mitsuhiro Kinoshita、Masahiko Morioka、Masato Taniguchi、Jun Shimizu
DOI:10.1246/bcsj.60.4005
日期:1987.11
salt 8 corresponding to the C-1–C-6 portion of amphotericin B aglycon (1) in 57% overall yield in 8 steps. The aldehydic segment 9 or 10 corresponding to the C-7–C-12 portion of 1 was also derived in 6 steps from 11 in 53 or 38% overall yield, respectively. Wittig condensation of 8 with 9 or 10 followed by four-step conversion afforded the C-1–C-12 segment, (3S,5R,8R,9R,11S)-1-O-t-butyldimethylsilyl-12-iodo-3
3-Deoxy-1,2-O-isopropylidene-α-D-glycero-D-erythro-pentofuranose (11) 被立体选择性地转化为 Witting 盐 8,对应于两性霉素 B 苷元的 C-1-C-6 部分( 1) 在 8 个步骤中以 57% 的总收率。与 1 的 C-7-C-12 部分相对应的醛链段 9 或 10 也分 6 个步骤从 11 中衍生而来,总产率分别为 53% 或 38%。8 与 9 或 10 的 Wittig 缩合,然后四步转化得到 C-1–C-12 片段,(3S,5R,8R,9R,11S)-1-Ot-丁基二甲基甲硅烷基-12-iodo-3,5 :8,9-二-O-异亚丙基-11-O-[(2-甲氧基乙氧基)甲基]-1,3,5,8,9,11-dodecanehexol(4)or(2S,4R,5R,8R, 10S)-1,2-脱水-12-Ot-丁基二甲基甲硅烷基-4