Reversal of <i>Anti</i> to <i>Syn</i> Diastereoselectivity in Crotyltitanation Reaction
作者:Jan Szymoniak、Nadine Thery、Claude Moïse
DOI:10.1055/s-1997-1002
日期:1997.11
η3-2-Methylcrotyl(tiglyl)titanocene reacts with aldehydes to afford anti homoallylic alcohols when the reaction is carried out in THF, and preferentially syn products when the solvent is HMPA/THF=3:1. This simple control of anti versus syn diastereoselectivity expands considerably the synthetic uses of the crotyltitanation reaction.