Stereoselective Synthesis of 4'-.ALPHA.-Alkylcarbovir Derivatives Based on an Asymmetric Synthesis or Chemoenzymatic Procedure.
作者:Keisuke KATO、Hisaki SUZUKI、Hiromichi TANAKA、Tadashi MIYASAKA、Masanori BABA、Kentaro YAMAGUCHI、Hiroyuki AKITA
DOI:10.1248/cpb.47.1256
日期:——
Stereoselective synthesis of 4'-α-alkylcarbovir derivatives 4 was described based on asymmetric synthesis or a chemoenzymatic procedure. The asymmetric alkylation of chiral acetal 7 gave the alkylated enol ethers 9a-c possessing a chiral quaternary carbon. The key carbocyclic intermediates 14a-c were synthesized from 9a-c via eleven-steps. Coupling of 14a-c with 2-amino-6-chloropurine followed by desilylation and subsequent hydrolysis afforded the target compounds 4a-c in moderate yield. The optically active cyclopentene intermediates 5a-c and 6a-c were also prepared by enzymatic resolution of (±)-5a-c and (±)-6a-c, respectively.
基于不对称合成或化学酶法过程,描述了 4'-α- 烷基卡巴韦衍生物 4 的立体选择性合成。通过手性缩醛 7 的不对称烷基化,得到了具有手性季碳的烷基化烯醇醚 9a-c。由 9a-c 经过 11 个步骤合成了关键的碳环中间体 14a-c。将 14a-c 与 2-氨基-6-氯嘌呤偶联,然后进行脱硅和水解,就得到了目标化合物 4a-c,收率适中。通过酶解 (±)-5a-c 和 (±)-6a-c 还分别制备出了具有光学活性的环戊烯中间体 5a-c 和 6a-c。