New methodology for the synthesis of variously substituted 2-oxazolines and one dihydrooxazine using aldehydes, amino alcohols, and N-bromosuccinimide as an oxidizing agent is described. This one-pot synthesis is characterized by mild reaction conditions, broad scope, high yields, and its preparative simplicity.
A Facile Synthesis of 2-Oxazolines via Dehydrative Cyclization Promoted by Triflic Acid
作者:Tao Yang、Chengjie Huang、Jingyang Jia、Fan Wu、Feng Ni
DOI:10.3390/molecules27249042
日期:——
oxazoline production. Herein, we report a triflicacid (TfOH)-promoted dehydrative cyclization of N-(2-hydroxyethyl)amides for synthesizing 2-oxazolines. This reaction tolerates various functional groups and generates water as the only byproduct. This method affords oxazoline with inversion of α-hydroxyl stereochemistry, suggesting that alcohol is activated as a leaving group under these conditions
The preparation of 2-oxazolines and related N-containing heterocycles from the corresponding hydroxyamides using XtalFluor-E ([Et2NSF2]BF4) as a cyclodehydration agent is described. A wide range of heterocycles are obtained under mild conditions in good to excellent yields. (C) 2012 Elsevier Ltd. All rights reserved.