Room Temperature Asymmetric Allylic Trifluoromethylation of Morita–Baylis–Hillman Carbonates
作者:Yun Li、Fang Liang、Qian Li、Yao-chang Xu、Quan-Rui Wang、Lei Jiang
DOI:10.1021/ol202572u
日期:2011.11.18
(DHQD)(2)PHAL-catalyzed asymmetric allylic trifluoromethylation of Morita-Baylis-Hillman adducts using a Rupert-Prakash reagent is reported. This transformation provided the S(N)2' trifluoromethylated products with good yields and excellent enantioselectivities at room temperature. It was also found that the reaction could be accelerated using acetonitrile as cosolvent.
DHQD催化的Rupert-Prakash试剂催化的Mrita-Baylis-Hillman加成体的不对称 allylic trifluoromethylation反应得以实现。此反应以S(N)2'型三氟etyl甲基化产物为主,产率较高且选择性优异,且可以在常温下高效完成。此外,乙腈作为共溶剂可加速反应进程。