Catalytic Enantioselective Synthesis of Allylic Boronates Bearing a Trisubstituted Alkenyl Fluoride and Related Derivatives
作者:Sota Akiyama、Koji Kubota、Malte S. Mikus、Paulo H. S. Paioti、Filippo Romiti、Qinghe Liu、Yuebiao Zhou、Amir H. Hoveyda、Hajime Ito
DOI:10.1002/anie.201906283
日期:2019.8.26
The first catalytic method for diastereo- and enantioselective synthesis of allylic boronates bearing a Z-trisubstituted alkenyl fluoride is disclosed. Boryl substitution is performed with either a Z- or E-allyldifluoride and is catalyzed by bisphosphine/Cu complexes, affording products in up to 99 % yield with >98:2 Z/E selectivity and 99:1 enantiomeric ratio. A variety of subsequent modifications
公开了用于非对映选择性和对映选择性合成带有Z-三取代烯基氟的烯丙基硼酸酯的第一种催化方法。硼基取代是用 Z- 或 E-烯丙基二氟进行的,并由双膦/Cu 配合物催化,得到的产物收率高达 99%,Z/E 选择性 >98:2,对映体比例为 99:1。各种后续修饰都是可行的,值得注意的例子是醛/醛亚胺的非对映选择性加成,以获得含有氟取代的立体季中心的高烯丙醇/胺。