A highly diastereoselective and enantioselectiveBrønstedacidcatalyzedreductive condensation of N−H imines was developed. This reaction is catalyzed by a chiral disulfonimide (DSI), uses Hantzsch esters as a hydrogen source, and delivers useful C2‐symmetric secondary amines.
Effective Conversion of Heteroaromatic Ketones into Primary Amines via Hydrogenation of Intermediate Ketoximes
作者:Christopher Borths、Kyle Baucom、Anil Guram
DOI:10.1055/s-0034-1379538
日期:——
A process to access heteroaromatic primary amines from the corresponding heteroaromatic ketones has been developed. A broad range of previously reported methods to convert ketones to primary amines was examined on heterocyclic ketones without success, including Leuckart–Wallach conditions, borane reductions, and transition-metal-catalyzed hydrogenations. Unique among the catalysts examined, Raney cobalt
LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DISPLAY, AND METHOD FOR PRODUCING LIQUID CRYSTAL DISPLAY
申请人:JSR CORPORATION
公开号:US20150092147A1
公开(公告)日:2015-04-02
A liquid crystal composition is described, including a liquid crystalline compound (A), and at least one nitrogen-containing compound (B) selected from compounds represented by formula (1) and compounds represented by formula (2),
wherein R′ is a hydrogen atom or a monovalent organic group that is bonded to the nitrogen atom via a chain-shaped hydrocarbon group or an alicyclic hydrocarbon group, R
2
and R
3
are independently a divalent organic group that is bonded to the nitrogen atom via a chain-shaped hydrocarbon group, an alicyclic hydrocarbon group or *—CO—R
4
—, A
1
is a nitrogen-containing heteroaromatic ring, X
1
is a cyclic ether group or a polymerizable unsaturated group, and R
10
is a divalent organic group that is bonded to the primary amino group via a chain-shaped hydrocarbon group or an alicyclic hydrocarbon group.