Enantioselective Rhodium‐Catalyzed Addition of Arylboroxines to N‐Unprotected Ketimines: Efficient Synthesis of Cipargamin
作者:Jinbin Zhu、Linwei Huang、Wei Dong、Naikai Li、Xingxin Yu、Wei‐Ping Deng、Wenjun Tang
DOI:10.1002/anie.201910008
日期:2019.11.4
N-unprotected ketimines is realized for the first time by employing chiral BIBOP-type ligands with a Rh loading as low as 1 mol %. A range of chiral α-trifluoromethyl-α,α-diaryl α-tertiary amines or 3-amino-3-aryloxindoles were formed with excellent ee values and yields by employing either WingPhos or PFBO-BIBOP as the ligand. The method has enabled an efficient enantioselective synthesis of cipargamin
通过使用具有低至1mol%的Rh负载的手性BIBOP型配体,首次实现了对映体选择性铑催化的芳基硼氧烷到N-未保护的酮亚胺的加成反应。通过使用WingPhos或PFBO-BIBOP作为配体,形成了一系列具有优异ee值和收率的手性α-三氟甲基-α,α-二芳基α-叔胺或3-氨基-3-芳基吲哚。该方法已经实现了西葫芦素的有效对映选择性合成。