A formal [4+1] cycloaddition of dimethoxycarbene to 3-perfluoroacyl-4H-chromenes: the synthesis of areno-condensed 7,7a-dihydro-4H-furo[3,4-b]pyrans
作者:Irina A. Semenova、Dmitry V. Osipov、Vitaly A. Osyanin、Pavel E. Krasnikov、Yuri N. Klimochkin
DOI:10.1007/s10593-023-03167-1
日期:——
The [4+1] annulation of in situ generated dimethoxycarbene to 3-trifluoroacetyl-4H-chromenes led to cyclic ortho esters, trifluoromethylsubstituted dihydrofuro[3,4-b]chromenes. In the case of 2-perfluoroacyl-1H-benzo[f]chromenes, representatives of a new heterocyclic system 7a,8-dihydro-11H-benzo[f]furo[3,4-b]chromene, were formed.
原位生成的二甲氧基羰基与 3-三氟乙酰基-4H-苯并吡喃的 [4+1] 环化反应产生了环状正交酯、三氟甲基取代的二氢呋喃并[3,4-b]苯并吡喃。在 2-全氟乙酰基-1H-苯并[f]色烯的情况下,形成了新杂环系统的代表 7a,8-二氢-11H-苯并[f]呋喃并[3,4-b]色烯。