Synthesis of a class of new phosphine-oxazoline ligands and their applications in palladium-catalyzed asymmetric addition of arylboronic acids to isatins
A class of new phosphine-oxazoline ligands was prepared from commercially available and inexpensive starting materials. As the first example, in situ formed catalysts generated from chiral phosphine-oxazolines and Pd(OAc)2 were successfully applied to the asymmetric addition reactions of arylboronic acids to isatins, and 3-aryl-3-hydroxyoxindoles were obtained in up to 97% yields and good enantioselectivities
Asymmetric [3 + 2] annulation of N-protected isatins with but-3-yn-2-one catalyzed by DIOP: facile creation of enantioenriched spiro[furan-2,3′-indoline]-2′,4(5H)-dione
作者:Zhong Lian、Min Shi
DOI:10.1039/c2ob25801c
日期:——
DIOP catalyzed highly enantioselective [3 + 2] annulation of N-protected isatins with but-3-yn-2-one has been disclosed, allowing the synthesis of enantioenriched spiro[furan-2,3′-indoline]-2′,4(5H)-dione in moderate yields along with good to high enantioselectivities under mild conditions.