Syntheses of isocarbacyclin by highly regioselective alkylation of allylic alcohols
作者:Kiyoshi Bannai、Toshio Tanaka、Noriaki Okamura、Atsuo Hazato、Satoshi Sugiura、Kenji Manabe、Koji Tomimori、Yoshinori Kato、Seizi Kurozumi、Ryoji Noyori
DOI:10.1016/s0040-4020(01)87859-5
日期:1990.1
Syntheses of isocarbacyclin (20) using highly regioselective alkylation of the new allylic alcohol intermediate 6 having an exocyclic double bond are described. The allylic alcohol 6 was prepared by (i) allylic rearrangement of the allylic alcohol 3 having an endocyclic double bond and (ii) reductive cyclization of γ-ethynyl aldehyde 11a which was synthesized from (R)-4-hydroxy-2- cyclopentenone derivative
描述了使用具有环外双键的新的烯丙基醇中间体6的高度区域选择性烷基化来合成异碳环素(20)。烯丙基醇6是通过(i)具有环内双键的烯丙基醇3的烯丙基重排和(ii)由(R)-4-羟基-2-环戊烯酮衍生物合成的γ-乙炔醛11a的还原环化而制备的。1在5个步骤。通过使用Murahashi的方法实现了烯丙基醇6的γ-烷基化,从而导致异碳环素的高度区域选择性的形成(区域选择性为99%)。烯丙醇的α-烷基化3 还获得了构建异卡巴环素的方法。