Palladium-Catalyzed Hydroesterification of Alkynes Employing Aryl Formates without the Use of External Carbon Monoxide
作者:Yuko Katafuchi、Tetsuaki Fujihara、Tomohiro Iwai、Jun Terao、Yasushi Tsuji
DOI:10.1002/adsc.201000750
日期:2011.2.11
highly efficient hydroesterification of alkynes employing aryl formates has been developed without the use of external carbon monoxide and at ambient pressure. The reaction in the presence of a palladium-xantphos catalyst system selectively affords α,β-unsaturated esters in good to high yields. Use of an aryl formate is crucial and alkyl formates did not react at all. The hydroesterification of norbornene
已经开发了在不使用外部一氧化碳的情况下并且在环境压力下使用芳基甲酸酯的炔烃的高效加氢酯化。在钯-黄磷催化剂体系存在下的反应以良好至高收率选择性地提供α,β-不饱和酯。甲酸芳基酯的使用至关重要,烷基甲酸酯根本不反应。降冰片烯和末端烯烃的加氢酯化也容易在相似的反应条件下进行。机理研究表明,加氢酯化过程中发生了芳基甲酸酯向一氧化碳和苯酚衍生物的转化。Xantphos作为芳基甲酸酯的转化和加氢酯化反应的配体都是非常有效的。