Scope of the organocatalysed asymmetric reductive amination of ketones with trichlorosilane
作者:François-Moana Gautier、Simon Jones、Xianfu Li、Stephen J. Martin
DOI:10.1039/c1ob05965c
日期:——
A highly active organocatalyst has been shown to affect the asymmetric reductive amination of ketones producing both aromatic and aliphatic amines. At 1 mol% catalyst loading, a series of structurally diverse chiral amines were quickly and economically prepared with good enantioselectivity and generally useful yield. The efficient synthesis of the calcimimetic (+)-NPS R-568 (67%, 89% ee) demonstrated the synthetic applicability of this methodology.
<scp>l</scp>-Valine derived chiral N-sulfinamides as effective organocatalysts for the asymmetric hydrosilylation of N-alkyl and N-aryl protected ketimines
作者:Chao Wang、Xinjun Wu、Li Zhou、Jian Sun
DOI:10.1039/c4ob01257g
日期:——
L-Valine derived N-sulfinamides have been developed as efficient enantioselective Lewis basic organocatalysts for the asymmetric reduction of N-aryl and N-alkyl ketimines with trichlorosilane. Catalyst 3c afforded up to 99% yield and 96% ee in the reduction of N-alkyl ketimines and up to 98% yield and 98% ee in the reduction of N-aryl ketimines.
METHOD FOR PRODUCING AN OPTICALLY ACTIVE TETRAHYDROQUINOLINE
申请人:Moroi Takashi
公开号:US20100036149A1
公开(公告)日:2010-02-11
The present invention provides an industrially advantageous production method of optically active tetrahydroquinolines of formula (1),
which comprises:
1) a step of reacting a β-ketoester of formula (2)
with an amine of formula (3)
to produce an enaminoester of formula (4);
2) a step of subjecting the enaminoester of formula (4) above obtained in 1) to asymmetric hydrogenation to produce an optically active β-amino acid derivative of formula (5);
3) a step of amidating the optically active β-amino acid derivative (5) above obtained in 2) to produce an amide of formula (6);
4) a step of alkoxycarbonylating the amide of formula (6) above obtained in 3) to produce a compound of formula (7);
and
5) a step of subjecting the compound of formula (7) above to cyclization to produce the optically active tetrahydroquinoline of formula (1).
Design of Modified Amine Transfer Reagents Allows the Synthesis of α-Chiral Secondary Amines via CuH-Catalyzed Hydroamination
作者:Dawen Niu、Stephen L. Buchwald
DOI:10.1021/jacs.5b05446
日期:2015.8.5
were used for the synthesis of chiral secondaryamines, competitive, nonproductive consumption of these reagents by the CuH species resulted in poor yields. In this paper, we report the design of a modified type of amine transfer reagent that addresses this limitation. This effort has enabled us to develop a CuH-catalyzed synthesis of chiral secondaryamines using a variety of amine coupling partners,