The Synthesis of Strained Methylene-bridged Bicyclic Olefins by the IntramolecularWittig Reaction
作者:Konrad B. Becker
DOI:10.1002/hlca.19770600111
日期:1977.1.26
A convenient synthesis of the strained methylene-bridged trans-cyclooctenes bicyclo[3.3.1]-1 (2)-nonene (1), bicyclo[4.2.1]-1(8)-nonene (2), and bicyclo[4.2.1]-1(2)-nonene (3) by the intramolecular Wittig reaction is described (see Schemes 1–4). The (3-oxocycloalkyl)alkyl-phosphonium bromides 20, 27 and 38 undergoing cyclization to the bridgehead olefins are formed by simple reaction sequences. The