Ruthenium-Catalyzed Hydrovinylation of N-Acetylenamines Leading to Amines with a Quaternary Carbon Center
摘要:
A catalytic hydrovinylation of N-acetylenamines with ethylene is reported. This new hydrovinylation reaction is catalyzed by a ruthenium hydride complex, RuHCl(CO)(PCy3)(2), providing a series of N-acetylamines with a quaternary carbon center with up to 99% yield.
The enantioselectivephospha-Mannichreaction of diethyl phosphite to unactivated N-DPP-protected ketimines catalyzed by a bifunctional iminophosphorane (BIMP) superbase organocatalyst is described. The reaction is applicable to ketimines bearing electron-rich and electron-poor aryl substituents and occurs with excellent yields and moderate enantioselectivities under mild reaction conditions.
Copper-Catalyzed Three-Component Domino Cyclization for the Synthesis of 4-Aryl-5-(arythio)-2-(trifluoromethyl)oxazoles
作者:Fuhong Xiao、Shanshan Yuan、Huawen Huang、Feng Zhang、Guo-Jun Deng
DOI:10.1021/acs.orglett.9b02934
日期:2019.11.1
A copper-catalyzed oxidative cyclization of oxime, arylthiol, and trifluoroacetic anhydride for the construction of trisubstituted oxazoles has been developed. This transformation combines N–O bond cleavage, C–H functionalization, and intramolecular annulation, providing a practical protocol for the introduction of a trifluoromethyl (−CF3) group at oxazole rings.
The compound represented by formula (1):
wherein
R
4
and R
5
each represents a hydrogen atom, a halogen atom, or a C1-C3 alkyl group; R
6
represents a C1-C4 alkyl group, a C3-C6 cycloalkyl group, or the like; R
7
, R
8
, and R
9
each represents a hydrogen atom, a halogen atom, or the like; R
10
represents a C1-C3 alkyl group, or the like; R
13
represents a C1-C3 alkyl group, or the like; and Q represents a phenyl group, or the like;
has an excellent control effect on pests.