application of binaphthyl-stabilized palladium nanoparticles (Bin-PdNPs) with chiral modifiers in asymmetric hydrogenation of N-heteroaromatics is revealed. With an appropriate ratio of R-BINAP/Bin-PdNPs used, the pre-prepared chiral nanocatalyst achieves asymmetric hydrogenations of 2-substituted quinolines with good to excellent yields and moderate enantioselectivities, which showed superior catalytic properties
Chiral 2,3-Disubstituted Indolines from Indoles and Aldehydes by Organocatalyzed Tandem Synthesis Involving Reduction by Trichlorosilane
作者:Lin Chen、Chao Wang、Li Zhou、Jian Sun
DOI:10.1002/adsc.201301133
日期:2014.7.7
The organocatalytic trichlorosilanereduction system has been successfully utilized to develop a multi‐step tandem approach for the easy preparation of chiral 2‐methyl‐3‐alkylindolines starting from simple 2‐methylindoles and aldehydes. A broad range of chiral 2‐methyl‐3‐alkylindoline products was obtained with high yields and enantioselectivities and excellent stereoselectivities by this approach
A series of 2-substituted 3-(toluenesulfonamidoalkyl)indoles was synthesized by application of (EtO)2POH or iodine as the catalyst, and was hydrogenated using chiral Pd catalyst, giving the 2,3-disubstituted indolines with up to 97% ee.