Regio- and Enantioselective Rhodium-Catalyzed Allylic Alkylation of Racemic Allylic Alcohols with 1,3-Diketones
作者:Sheng-Biao Tang、Xiao Zhang、Hang-Fei Tu、Shu-Li You
DOI:10.1021/jacs.8b05126
日期:2018.6.20
Highly regio- and enantioselective rhodium-catalyzed allylic alkylation of 1,3-diketones with racemic secondary allylic alcohols is reported. In the presence of a Rh-catalyst derived from the Carreira (P, olefin)-ligand and TFA as an additive, chiral branched α-allylated 1,3-diketones could be obtained in good to excellent yields, with excellent regio- and enantioselectivity ( b/ l > 19/1, 86-98% ee)
据报道,高度区域选择性和对映选择性铑催化 1,3-二酮与外消旋仲烯丙醇的烯丙基烷基化。在衍生自 Carreira(P,烯烃)-配体和 TFA 作为添加剂的 Rh 催化剂存在下,手性支化 α-烯丙基化 1,3-二酮可以以良好到极好的产率获得,具有极好的区域选择性和对映选择性( b/ l > 19/1, 86-98% ee)。从原子经济性的观点来看,烯丙醇作为亲电子试剂的直接利用代表了一种改进。芳基和脂肪族取代的烯丙醇都是合适的底物,具有出色的反应结果。该反应条件温和,底物范围广,底物易得。