Photochemically Promoted Aza-Diels–Alder-Type Reaction: High Catalytic Activity of the Cr(III)/Bipyridine Complex Enhanced by Visible Light Irradiation
作者:Noriyoshi Arai、Takeshi Ohkuma
DOI:10.1021/acs.joc.7b00838
日期:2017.7.21
Aza-Diels–Alder-type cycloaddition reactions between a range of N-arylimines and functionalized alkenes were effectively catalyzed by the Cr(III)/bipyridine complex under irradiation of blue light, to give the corresponding 1,2,3,4-tetrahydroquinoline derivatives in high yields with excellent diastereoselectivity. Typically, the reaction of benzylideneaniline with 1-vinyl-2-pyrrolidinone proceeded
<sup><i>t</i></sup>BuOK-Promoted Cyclization of Imines with Aryl Halides
作者:Ya-Wei Li、Hong-Xing Zheng、Bo Yang、Xiang-Huan Shan、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.0c01615
日期:2020.6.5
A transition-metal-free indole synthesis using radical coupling of 2-halotoluenes and imines via the later-stage C–N bond construction was reported for the first time. It includes an aminyl radical generation by C–H cleaving addition of 2-halotoluenes to imines via the carbanion radical relay and an intramolecular coupling of aryl halides with aminyl radicals. One standard condition can be used for
reductive monoalkyl- ation of amines and amine derivatives with aldehydes is reported. Treatment of aldehydes with primary amines, secondaryamines, O- trimethylsilylhydroxylamine, and N,N-dimethylhydrazine in lithi- um perchlorate/diethylether and trimethylsilyl chloride, followed by BH3·NEt3 reduction, and straightforward workup afforded sec- ondary amines, tertiary amines, N-substituted hydroxylamines
Azaheteroalkene metathesis: reaction of imines with molybdenum(vi) bis(imide) complexes
作者:Gidget K. Cantrell、Tara Y. Meyer
DOI:10.1039/a702780j
日期:——
Bis(imide) complexes (dme)Cl
2
Mo(NR)
2
(R =
Bu
t
, C
6
H
3
Pr
i
2
-2,6)
and (Bu
t
O)
2
Mo(NAr)
2
(Ar =
C
6
H
3
Pr
i
2
-2,6) undergo
imide/imine metathesis with PhNCH(Bu
t
) or
(Pr
n
)NCHPh.
A visible-light-mediated process for dehydrogenation of amines has been described. The given protocol showed a broad substrate scope, mild reaction conditions and excellent results without the requirement of tedious purification. This process can be applied in one-pot functionalization of secondary amines with various nucleophiles through the cooperation of visible-light and Lewis acid catalysis, leading