Visible light photooxidative cyclization of amino alcohols to 1,3-oxazines
摘要:
1,3-Amino alcohols were prepared to examine how structure affects the oxidation of tertiary amines in visible light photocatalysis. These substrates were cyclized to produce oxazines following the photooxidative formation of iminium ions using catalytic Ru(bpy)(3)Cl-2. Amino alcohol derivatives of tetrahydroisoquinoline, tetrahydroquinoline, pyrrolidine, and Delta(3)-piperidine all were found to be viable substrates. In the case of the unsaturated piperidines, cyclization is accompanied by addition of methanol across the alkene; most likely occurring via a conjugate addition to an intermediate alpha,beta-unsaturated iminium ion prior to oxazine formation. (c) 2013 Elsevier Ltd. All rights reserved.
Anti‐Markovnikov Hydroamination and Hydroalkoxylation of Allylic Alcohols Promoted by a Simple Rare‐Earth Metal Trialkyl Complex
作者:Xiancui Zhu、Jinrong Sun、Zhixin Wu、Dianjun Guo、Shuangliu Zhou、Shaowu Wang
DOI:10.1002/adsc.202301142
日期:2024.3.19
hydroalkoxylation of allylic alcohols catalyzed by a simple catalyst Y(CH2SiMe3)3(THF)2 has been developed, providing a variety of γ-amino and γ-alkoxy alcohols in good yields under mild conditions. Moreover, this protocol is applied to the synthesis of drug molecules Propipocaine and Proroxan. The rare-earth catalyst features readily available, wide substrate compatability, exclusive anti-Markovnikov selectivity