Visible‐Light‐Induced Aerobic Oxidative C
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−H Functionalization of Glycine Derivatives for 2‐Substituted Benzoxazoles
作者:Zhi‐Qiang Zhu、Shan Liu、Zhi‐Yu Hu、Zong‐Bo Xie、Juan Tang、Zhang‐Gao Le
DOI:10.1002/adsc.202100134
日期:2021.5.18
Csp3−H functionalization reaction of glycine derivatives by visible-light photoredox catalysis. A wide range of glycine derivatives readily undergo the oxidative cyclization to afford various 2-substituted benzoxazoles. Importantly, this photocatalytic intramolecular dehydrogenative coupling reaction allows for the C−H functionalization of glycine derivatives involving short peptides under mild conditions
A versatile switching method for N- or O-alkylation of 2-aminophenols using ionic liquids: Selective access to benzo[1,4]oxazine-2-one and benzo[1,4]oxazine-3-one derivatives
A new method is developed for efficient and chemoselective synthesis of benzo[1,4]oxazineone derivatives. By the choice of an appropriate ionic liquid, the process is directed towards selective O- or N-alkylation to give the desired isomeric structures, as the major product of the reaction. In the presence of choline hydroxide, benzo[1,4]oxazine-3-one derivatives are formed, while by using choline
A convenient synthesis of 3,4-dihydro-1,4-benzoxazin-2-ones
作者:Nace Zidar、Danijel Kikelj
DOI:10.1016/j.tet.2008.04.010
日期:2008.6
3,4-Dihydro-1,4-benzoxazin-2-one was prepared for the first time by catalytic hydrogenation of 4-benzyl-3,4-dihydro-1,4-benzoxazin-2-one. A simple and efficient synthesis of 4-benzyl- and 4-alkyl-3,4-dihydro-1,4-benzoxazin-2-one derivatives from ethyl 2-(2-hydroxyphenylamino)acetate and aldehydes is described. Some considerations regarding the reactivity of 3,4-dihydro-1,4-benzoxazin-2-ones are given. (C) 2008 Elsevier Ltd. All rights reserved.