已经开发出一种简单且容易的一锅反应,以提供包含两个不同取代的N原子的N,N'-二取代的苯并咪唑酮和咪唑并吡啶并酮的不同范围。协同的Pd(II)/ Ag(I)系统促进了(杂)芳族胺和异氰酸酯的顺序加成/分子内CH-H酰胺化反应,导致形成两个C-N键。一种机制,涉及在Ag 2 CO 3氧化剂和Pd(OAc)2存在下通过单电子转移(SET)生成的自由基中间体提出了路易斯酸。该协议使用易于获得的起始原料,良好的官能团耐受性和高效率,提供了一种操作简便,简单且可靠的方法。
Mild and selective deprotection of carbamates with Bu4NF
摘要:
A new mild method allowing the removal of carbamates using TBAF in THF is reported. Reactions were performed on indole, indoline, N-methyl aniline, aniline and tryptamine derivatives. The observed selectivity according to the carbamates or the substrates is discussed. A mechanism is postulated. (C) 2004 Published by Elsevier Ltd.
hydroaminoalkylation of terminal alkenes, 1,3‐dienes, or styrenes allows a direct and highly atom efficient (100 %) synthesis of amines which can result in the formation of two regioisomers, the linear and the branched product. We present a new titanium catalyst with 2,6‐bis(phenylamino)pyridinato ligands for intermolecular hydroaminoalkylation reactions of styrenes and 1‐phenyl‐1,3‐butadienes that delivers the
N-Benzyloxy- and N-tert-butoxycarbonyltrifluoromethylsulfonyl-4-trifluoromethylanilides were prepared and were found to be chemoselective and shelf-storable alkoxycarbonylation reagents.
Selective nitrolytic deprotection of N -BOC-amines and N -BOC-amino acids derivatives
作者:Paolo Strazzolini、Tiziana Melloni、Angelo G Giumanini
DOI:10.1016/s0040-4020(01)00900-0
日期:2001.10
configuration of the substrates and without affecting copresent Z and ester functions, with a remarkable selectivity towards acid sensitive t-butylesters. The obtained aminoacidsesters, isolated and characterized in the form of nitrates salts, proved to be suitable intermediates to be used in peptide synthesis.
A nickel-catalyzed, efficient C-N bond reduction of aromatic and benzylic ammonium triflates has been developed using sodium isopropoxide as a reducing agent. The high efficiency, mild conditions, and nice compatibility...
Generation and Alkylation of α-Carbamyl Radicals via Organic Photoredox Catalysis
作者:Joshua B. McManus、Nicholas P. R. Onuska、David A. Nicewicz
DOI:10.1021/jacs.8b04890
日期:2018.7.25
Strategies for the direct C-H functionalization of amines are valuable as these compounds comprise a number of pharmaceuticals, agrochemicals and natural products. This work describes a novel method for the C-H functionalization of carbamate-protected secondary amines via α-carbamyl radicals generated using photoredox catalysis. The use of the highly oxidizing, organic acridinium photoredox catalyst