Enantioselective Carbonyl Propargylation by Iridium-Catalyzed Transfer Hydrogenative Coupling of Alcohols and Propargyl Chlorides
作者:Sang Kook Woo、Laina M. Geary、Michael J. Krische
DOI:10.1002/anie.201203334
日期:2012.7.27
It takes alkynes! Exposure of propargyl chlorides to primary benzylic alcohols in the presence of [Ir(cod)(R)‐segphos}]OTf (cod=1,5‐cyclooctadiene, segphos=5,5′‐bis(diphenylphosphino)‐4,4′‐bi‐1,3‐benzodioxole, Tf=trifluoromethanesulfonyl) results in hydrogen exchange to give allenyliridium–aldehyde pairs that combine to form products of propargylation with high ee value (see scheme). The reaction
它需要炔烃!在[Ir(cod)(R)-segphos}] OTf(cod = 1,5-环辛二烯,segphos = 5,5'-bis(diphenylphosphino)-4,4 )的存在下将炔丙基氯暴露于伯苄醇中'-bi-1,3-苯并二恶唑,Tf =三氟甲磺酰基)导致氢交换,得到烯丙基铱-醛对,这些对结合形成具有高ee 值的炔丙基化产物(参见方案)。该反应也可以使用醛进行。