Regiochemistry on photoamination of stilbene derivatives with ammonia via electron transfer
摘要:
The regiochemistry of photoamination of 1,2-diarylethene (1) with ammonia in the presence of p-dicyanobenzene (DCNB) has been investigated. The photoamination of stilbene and p,p'-dimethoxystilbene gave 1-amino-1,2-diphenylethane and 1-amino-1,2-bis(p-methoxyphenyl)ethane, respectively. The photoamination of unsymmetric 1-aryl-2-phenylethene having an alkoxy group on the para position occurred selectively to give 1-amino-2-aryl-1-phenylethane. On the other hand, the photoamination of 1-aryl-2-phenylethene having a methyl and chloro group on the para position or methoxy group on the meta and ortho positions gave both 1-amino-2-aryl-1-phenylethane and 1-amino-1-aryl-2-phenylethane. The regiochemistry is related with the distribution of positive charge in the cation radicals of 1 generated from photochemical electron transfer to DCNB.
Alkaline-Metal-Catalyzed One-Pot Aminobenzylation of Aldehydes with Toluenes
作者:Guoqing Liu、Patrick J. Walsh、Jianyou Mao
DOI:10.1021/acs.orglett.9b02737
日期:2019.11.1
A novel and easily accessible MN(SiMe3)2 (M = Li or Na)/Cs2CO3 co-catalyzed benzylation of in situ generated N-(trimethylsilyl) aldimines with toluene derivatives has been successfully developed. The catalyst exhibits high chemoselectivity for deprotonation of toluenes at the benzylic position. The utility of this system is exemplified by the one-pot synthesis of a diverse array of bioactive 1,2-diarylethylamines
已成功开发了一种新颖且易于使用的MN(SiMe 3)2(M = Li或Na)/ Cs 2 CO 3催化原位生成的N-(三甲基甲硅烷基)亚胺与甲苯衍生物的苄基化反应。该催化剂对苄基位置的甲苯去质子表现出高化学选择性。一锅合成具有优异效率和宽泛的官能团耐受性的各种生物活性1,2-二芳基乙胺的例子说明了该系统的实用性。
THERAPEUTIC FLUOROETHYL UREAS
申请人:Chow Ken
公开号:US20070270498A1
公开(公告)日:2007-11-22
Compounds of the formula
or a pharmaceutically acceptable salt thereof or a tautomer thereof, wherein A and B are as described herein, are useful for treating conditions afflicting mammals.