Reductive amine deallyl- and debenzylation with alkali metal in Silica Gel (M-SG)
作者:Partha Nandi、James L. Dye、James E. Jackson
DOI:10.1016/j.tetlet.2009.04.058
日期:2009.7
Alkali metals in silica gel (the M-SG materials) are effective reagents for reductive deallylation, debenzylation, debenzhydrylation, and detritylation of amines. As such, these reagents provide a convenient alternative to traditional metal ammonia solutions for this class of deprotections.
Elaboration of the ether cleaving ability and selectivity of the classical Pearlman's catalyst [Pd(OH)2/C]: concise synthesis of a precursor for a myo-inositol pyrophosphate
作者:Alson Mart、Mysore S. Shashidhar
DOI:10.1016/j.tet.2012.09.016
日期:2012.11
The cleavage of propargyl, allyl, benzyl, and PMB ethers by Pd(OH)2/C can be tuned in that order, by varying the reaction conditions. Other moieties such as C–C double bonds, esters, trityl ether, p-bromo and p-nitrobenzyl ethers are stable to these reaction conditions. Cleavage of allyl ethers can be made catalytic by using 1:1 mixture of Pd(OH)2/C and Pd/C. The synthetic potential of the selective
Hydrogen-bond-activated C-N bond cleavage of allylic amines was realized in Pd-catalyzed allylic alkylation to form the C-C bond product. The method could be expanded to a series of allylic amines and carbonyl compounds with excellent results. It provides a new and convenient access to C-C bond formation based on Pd-catalyzed allylic alkylation of allylic amines by using only inexpensive alcohol solvents.
烯丙胺的氢键活化 CN 键断裂是在 Pd 催化的烯丙基烷基化中实现的,以形成 CC 键产物。该方法可以扩展到一系列烯丙基胺和羰基化合物,并取得了优异的结果。它通过仅使用廉价的醇溶剂,为基于 Pd 催化的烯丙基胺的烯丙基烷基化形成 CC 键提供了一种新的便捷途径。
Thiyl Radical-Mediated Cleavage of Allylic C−N Bonds: Scope, Limitations, and Theoretical Support to the Mechanism
作者:Stéphanie Escoubet、Stéphane Gastaldi、Vitaliy I. Timokhin、Michèle P. Bertrand、Didier Siri
DOI:10.1021/ja049859x
日期:2004.10.1
Thiols mediate the radical isomerization of allylic amines into enamines. The reaction results in the cleavage of the allylic C-N bond, after treatment with aqueous HCl. The mechanism involves the abstraction of an allylic hydrogen alpha to nitrogen by thiylradical, followed by a return hydrogen transfer from the thiol to the carbon gamma to nitrogen in the intermediate allylic radical. The scope and
One-Pot Synthesis of<i>O</i>-Allylhydroxylamines through the Organocatalytic Oxidation of Tertiary Allylic Amines Followed by a [2,3]-Meisenheimer Rearrangement
作者:Alexis Theodorou、Dimitris Limnios、Christoforos G. Kokotos
DOI:10.1002/chem.201406173
日期:2015.3.23
A cheap, green, and highly efficient one‐pot method for the synthesis of O‐protected allylicalcohols is described. By utilizing 2,2,2‐trifluoroacetophenone as the organocatalyst and H2O2 as the oxidant, a variety of allylicamine N‐oxides were synthesized, which upon heating are converted to the final products through a [2,3]‐Meisenheimer rearrangement.
描述了一种便宜,绿色,高效的一锅法,用于合成O保护的烯丙基醇。利用2,2,2-三氟苯乙酮作为有机催化剂,使用H 2 O 2作为氧化剂,合成了各种烯丙基胺N-氧化物,加热后通过[2,3] -Meisenheimer转化为最终产物。重排。