Dinuclear gold(I)‐N‐heterocyclic carbene complexes: Synthesis, characterization, and catalytic application for hydrohydrazidation of terminal alkynes
作者:Seema Yadav、Sriparna Ray、Ajeet Singh、Shaikh M. Mobin、Tapta Kanchan Roy、Chandrakanta Dash
DOI:10.1002/aoc.5942
日期:2020.11
Dinuclear gold(I)‐N‐heterocyclic carbenecomplexes were developed for the hydrohydrazidation of terminal alkynes. The gold(I)‐N‐heterocyclic carbenecomplexes 2a‐2b were synthesized in good yields from silver complexes synthesized in situ, which in turn were obtained from the corresponding imidazolium salts with Ag2O in dichloromethane as a solvent. The new air‐stable gold(I)‐NHCcomplexes, 2a‐2b, were
The invention concerns a water soluble compound of formula (a) wherein: A represents naphthyl or phenyl; and Ar
1
and Ar
2
independently represent a saturated or aromatic carbocyclic group; X
a
, X
b
are independently selected among an amino group, an ammonium group and an amino group modified by a linear polyoxyalkylene chain, provided that at least one of X
a
and X
b
represents ammonium or modified amino.
Enantioselective hydrogenation of the C:N group: a catalytic asymmetric reductive amination procedure
作者:Mark J. Burk、John E. Feaster
DOI:10.1021/ja00041a067
日期:1992.7
substituents on phosphorus-linked aryl groups dramatically enhance the enantioselectivity. Such electronic effects of ligands on the enantioselectivity are rare, and as in the welldocumented case of Mn(II1)-mediated epoxidation reactions,' these may play an important role in the design of new catalysts. The highest enantioselectivities are obtained in nonpolar solvents (C6F6 = hexane > benzene > THF),
Compounds of formula VII are described:
1
wherein A represents phenyl or naphthyl and
Ar
1
and Ar
2
independently represent a saturated or aromatic carbocyclic group. The compounds may be prepared by reducing the nitrile functions of a compound of formula I:
2
描述了式 VII 的化合物:
1
其中 A 代表苯基或萘基,且
Ar
1
和 Ar
2
分别代表饱和或芳香碳环基团。这些化合物可通过还原式 I 化合物的腈基官能团来制备:
2
Gold-Catalyzed Hydrohydrazidation of Terminal Alkynes
作者:Dmitry P. Zimin、Dmitry V. Dar’in、Valentin A. Rassadin、Vadim Yu. Kukushkin
DOI:10.1021/acs.orglett.8b02019
日期:2018.8.17
Facile gold-catalyzed hydrohydrazidation of alkynes with various hydrazides (RCONHNH2)-C-2 (R = Alk or Ar; including those with an additional nudeophilic moiety) in the presence of Ph3PAuNTf2 (6 mol %) leading to a wide range of substituted keto-N-acylhydrazones (18 examples) in excellent to good yields (99-66%) is reported. This novel metal-catalyzed coupling proceeds under mild conditions (chlorobenzene, 60 degrees C), exhibits high functional group tolerance, and is insensitive to the electronic and steric effects of the substituents in the reactants.