Copper-catalyzed oxidative esterification of ortho-formyl phenols without affecting labile formyl group
作者:Yong Zheng、Wei-Bin Song、Li-Jiang Xuan
DOI:10.1016/j.tetlet.2015.06.024
日期:2015.7
A copper-catalyzed oxidativeesterification of ortho-formyl phenols with aldehydesusing TBHP as oxidant in water is developed. Besides aromatic and aliphatic aldehydes, benzylic alcohols are also suitable for this reaction. The sensitive formyl group remains intact under oxidative conditions. This method provides an alternative protocol for classical esterification reactions.
Preparation of Functional Benzofurans, Benzothiophenes, and Indoles Using Ester, Thioester, and Amide via Intramolecular Wittig Reactions
作者:Siang-en Syu、Yu-Ting Lee、Yeong-Jiunn Jang、Wenwei Lin
DOI:10.1021/ol201062r
日期:2011.6.3
Preparation of new types of highly functional benzofurans, benzothiophenes, and indoles is realized via intramolecular Wittig reactions with the corresponding ester, thioester, and amide functionalities. The key intermediates, phosphorus ylides, presumably result from the addition of Bu3P toward aldehydes followed by acylation and deprotonation. Synthesis of functional benzofurans directly starting