Platinum/Scandium-Cocatalyzed Cascade Cyclization and Ring-Opening Reaction of Tertiary Amines with Substituted Salicylaldehydes to Synthesize 3-(Aminoalkyl)coumarins
oxidative dehydrogenation of α,β-C(sp3)−H bonds of tertiary amines in the presence of ambient oxygen followed by reactions with substituted salicylaldehydes is revealed. The in situ formed enamines reacted with various salicylaldehydes, which resulted in the development of a one-pot synthetic protocol involving aldol reaction, cyclization, and then ring-opening.
Catalytic Access to Bridged Sila-<i>N</i>-heterocycles from Piperidines via Cascade sp<sup>3</sup> and sp<sup>2</sup> C–Si Bond Formation
作者:Jianbo Zhang、Sehoon Park、Sukbok Chang
DOI:10.1021/jacs.8b08733
日期:2018.10.17
Described herein is the development of an unprecedented route to bridged sila- N-heterocycles via B(C6F5)3-catalyzed cascade silylation of N-aryl piperidines with hydrosilanes. Mechanistic studies indicated that an outer-sphere ionic path is operative to involve three sequential catalytic steps having N-silyl piperidinium borohydride as a resting species: (i) dehydrogenation of the piperidine ring
N-ACYL ANTHRANILIC ACID DERIVATIVE OR SALT THEREOF
申请人:Yokotani Junichi
公开号:US20110275797A1
公开(公告)日:2011-11-10
An N-acyl anthranilic acid derivative represented by general formula (1) or a salt thereof is useful for prevention or treatment of diseases associated with excessive production of collagen. (In the formula, R
1
represents a carboxyl group or the like; R
2
represents a hydrogen atom or the like; R
3
represents an optionally substituted aryl group or the like; X
1
represents a carbonyl group; X
2
represents a bonding hand; X
3
represents a bonding hand; X
4
represents a bonding hand or the like; and A represents an optionally substituted phenyl group or the like.)
various cis-2,3-diacetoxylated piperidines. On the other hand, tetrahydroisoquinoline derivatives gave various α-C−H functionalized products in the presence of PhI(OAc)2. Nitroalkanes, dialkyl malonates, and β-keto ester are active participants in this couplingreaction. Meanwhile, α-amino nitriles can also be obtained by oxidativecoupling of amines with malononitrile.
A mild platinum-catalyzed oxidative dehydrogenation of α,β-C(sp3)−H bonds of tertiaryamines in the presence of ambient oxygen is revealed, and the in situ formed enamines subsequently reacting with various nitroolefins resulted in the development of two one-pot synthetic protocols involving Michael addition−elimination and Michael addition−cyclization. By using different functionalized nitroolefins
揭示了在环境氧存在下温和的铂催化叔胺的α,β-C(sp 3)-H键的氧化脱氢,随后原位形成的烯胺与各种硝基烯烃反应导致形成两个锅合成协议,涉及迈克尔加成消除和迈克尔加成环化。通过使用与当前氧化条件相容的不同官能化硝基烯烃,可以方便地分别获得两种结构上不同的产物,即三取代的烯胺和发色[2,3- b ]哌啶。