New Routes to Isomerically Pure Cyclopentanes. Synthesis of (3<i>S</i>,4<i>S</i>)-3,4-Bis(benzoyloxymethyl)cyclopentan-1-ol using Palladium-Catalyzed [2 + 3] Cycloaddition
作者:Marianne Janson、Ingemar Kvarnström、Stefan C. T. Svensson、Björn Classon、Bertil Samuelsson
DOI:10.1055/s-1993-25815
日期:——
Two different routes to the enantiomerically pure (3S,4S)-3,4-bis-(benzoyloxymethyl)cyclopentan-1-ol (6), a useful intermediate for the synthesis of a number of natural products, are described. Formation of the chiral five-membered ring was achieved using a palladium-catalyzed [2+3] cycloaddition between 2-(acetoxymethyl)-3-(trimethylsilyl)propene and optically active methyl (E)-3-O-benzyl-5,6-dideoxy-1, 2-O-isopropylidene-α-D-xylo-hept-5-enofuranuronate or ethyl (4R, Z)-4,5-(isopropylidenedioxy)pent-2-enoate.
本文介绍了获得对映体纯度为(3S,4S)-3,4-双(苯甲酰氧甲基)环戊烷-1-醇(6)的两种不同途径,该化合物是合成多种天然产物的有用中间体。2-(acetoxymethyl)-3-(trimethylsilyl)propene 与具有光学活性的甲基 (E)-3-O-benzyl-5、6-二脱氧-1,2-O-异亚丙基-δ-D-氧代-庚-5-enofuranuronate 或 (4R,Z)-4,5-(异亚丙基二氧基)戊-2-烯酸乙酯的光学活性。