Convergent Synthesis of Dihydropyrans from Catalytic Three-Component Reactions of Vinylcyclopropanes, Diazoesters, and Diphenyl Sulfoxide
作者:Ya-Lin Zhang、Rui-Ting Guo、Heng Luo、Xin-Shen Liang、Xiao-Chen Wang
DOI:10.1021/acs.orglett.0c01992
日期:2020.7.17
three-component reaction of vinylcyclopropanes, diazoesters, and diphenyl sulfoxide has been developed. The reaction gives polysubstituted dihydropyrans as the reaction products. Mechanistic studies indicate that isomerization of vinylcyclopropanes gives conjugated dienes, which then undergo [4 + 2]-cycloaddition with vicinal tricarbonyl compounds generated by oxygen atom transfer from diphenyl sulfoxide
乙烯基环丙烷,重氮酸酯和二苯亚砜的新型Rh(I)/ La(III)共催化三组分反应已得到开发。反应得到多取代的二氢吡喃,作为反应产物。机理研究表明,乙烯基环丙烷的异构化产生共轭二烯,然后与氧原子从二苯亚砜转移至重氮酸酯生成的邻三羰基化合物发生[4 + 2]-环加成反应。