Enantioselective Synthesis of Anti Homoallylic Alcohols from Terminal Alkynes and Aldehydes Based on Concomitant Use of a Cationic Iridium Complex and a Chiral Phosphoric Acid
We report a highly diastereo- and enantioselective synthesis of anti homoallylic alcohols fromterminalalkynes via (E)-1-alkenylboronates based upon two catalytic reactions: a cationic iridium complex-catalyzed olefin transposition of (E)-1-alkenylboronates and a chiral phosphoric acid-catalyzed allylation reaction of aldehydes.
Highly diastereoselective reactions using masked allylic zinc reagents
作者:Philip Jones、Paul Knochel
DOI:10.1039/a805953e
日期:——
Substituted allylic organozinc reagents have been prepared using a novel fragmentation reaction; the resulting allylic zinc species are configurationally stable and give excellent regio- and diastereo-selectivities.
Preparation and Reactions of Masked Allylic Organozinc Reagents
作者:Philip Jones、Paul Knochel
DOI:10.1021/jo981623m
日期:1999.1.1
Allyliczinc reagents have been prepared from sterically hindered homoallylic alcohols 10 and 13, using a novel fragmentation reaction of the corresponding zinc alkoxide, without any homocoupling products. These allyliczinc reagents react with a range of electrophiles in good to excellent yields. Substitutedallyliczinc reagents have also been prepared in this manner. alpha-Substituted homoallylic