Vinyl Dihydropyrans and Dihydrooxazines: Cyclizations of Catalytic Ruthenium Carbenes Derived from Alkynals and Alkynones
作者:Fermín Cambeiro、Susana López、Jesús A. Varela、Carlos Saá
DOI:10.1002/anie.201400675
日期:2014.6.2
A novel synthesis of 2‐vinyldihydropyrans and dihydro‐1,4‐oxazines (morpholine derivatives) from alkynals and alkynones has been developed. The cyclizations require a mild generation of catalytic ruthenium carbenes from terminal alkynes and (trimethylsilyl)diazomethane followed by trapping with carbonyl nucleophiles. Mechanistic aspects of the new cyclizations are discussed.
已经开发了由炔烃和炔酮合成2-乙烯基二氢吡喃和二氢-1,4-恶嗪(吗啉衍生物)的新方法。环化需要从末端炔烃和(三甲基甲硅烷基)重氮甲烷中轻度生成催化钌碳烯,然后用羰基亲核试剂捕集。讨论了新环化的机械方面。