Action du chloroallyllithium sur les aldehydes et les cetones: synthese en une etape d'alcools β-ethyleniques γ-chlores de configuration z et d'epoxydes α-ethyleniques bi- ou tri-substitues
作者:A. Doucoure、B. Mauze、L. Miginiac
DOI:10.1016/s0022-328x(00)87068-0
日期:1982.9
Chloroallyllithium readily reacts with aliphatic and aromatic aldehydes and ketones to produce, in a one-step reaction, Z-γ-chlorinated-β-ethylenic alcohols and bi- or tri-substituted epoxides.
An iridium-catalyzed enantioselective ring-opening of alkenyl oxiranes by unactivated carboxylicacids has been developed. The reaction undergoes at ambient conditions between an in-situ-generated chiral iridium-π-allyl complex and carboxylicacids to provide rapid access to valuable alkenyl diols in high yields. The synthetic utility of this method is demonstrated by the elaboration of the products