Synthesis of a highly functionalised bicyclo[3.3.0]octane
作者:Alan T. Hewson、David T. MacPherson
DOI:10.1016/s0040-4039(00)94207-2
日期:1983.1
The bicyclo[3.3.0]octanes 4 and 5 are prepared by making use of vinyl phosphonium salts, and 4 is used in formal total syntheses of chrysomelidial and loganin.
Process for preparing 3-hydroxymethyl-4-(aryl or heterocyclic)-cyclopentanones
申请人:——
公开号:US20020016492A1
公开(公告)日:2002-02-07
Processes are disclosed for preparing 3-hydroxymethylcyclopentanone compounds, which are useful as intermediates in the preparation of HIV chemokine CCR-5 receptor antagonists. A process is described in which the compounds are prepared by opening the cyclopropyl ring of a (1-alkoxycarbonyl-2-oxo)-trans-bicyclo[3.1.0]hexane compound by addition of a nucleophile to the cyclopropyl ring, and then decarboxylating the resulting 2-alkoxycarbonyl-3-(Nu-methyl)-cyclopentanone (Nu=the added nucleophilic group) via base solvolysis. Also described is a process for preparing the bicyclo[3.1.0]hexane precursors by the catalyzed cyclopropanation of a suitable alpha-diazo-beta-ketoester. The preparation of the alpha-diazo-beta-ketoesters and precursors thereto are also disclosed.