Chiral Monodentate Phosphines and Bulky Carboxylic Acids: Cooperative Effects in Palladium-Catalyzed Enantioselective C(sp3)-H Functionalization
作者:Tanguy Saget、Sébastien J. Lemouzy、Nicolai Cramer
DOI:10.1002/anie.201108511
日期:2012.2.27
important indoline scaffold is provided with enantiomeric ratios of up to 98:2 in palladium(0)‐catalyzed C(sp3)–H activations of aryl triflates. The key is the combination of the electron‐rich monodentate Sagephos and the bulky 9H‐xanthene‐9‐carboxylicacid. Both participate in a highly cooperative manner in the enantiodetermining concerted‐deprotonation‐metalation step (see scheme, Tf=triflate).