Stereoselective Synthesis of α,α′‐Spirane‐Bridged Dibenzyl Ligands
作者:Guixian Hu、Christian Rømming、Kjell Undheim
DOI:10.1080/00397910500186250
日期:2005.9.1
Benzylation in the alpha,alpha'-positions in the benzospirane, 2,2'-spirobiindane in a cis,cis manner has been effected from the corresponding diketone. Initial Grignard reactions and subsequent water elimination provided a stereoisomeric mixture of alpha,alpha'-alkylidene intermediates, which were stereoselectively hydrogenated to cis,cis-dibenzyl derivatives. The structure of intermediates in the reaction sequence has been ascertained by X-ray analyses.
Leuchs; Lock, Chemische Berichte, 1915, vol. 48, p. 1437