Synthesis of 2H ,4H ,9bH -furo[3,2-c][1]benzopyrans by a new intramolecular cycloaddition of a carbonyl ylide to an acetylene
作者:C. Bernaus、J. Font、March P. de
DOI:10.1016/s0040-4020(01)88295-8
日期:1991.9
Thermal treatment of oxiranes 1 and 4 affords 2H, 4H, 9H -furo[3,2-c][1]benzopyrans 5 and 6 through an intra-molecular 1,3-dipolar cycloaddition between the carbonyl ylide, generated by ring opening of the oxirane, and the acetylene moiety.
通过对羰基内酯进行分子内的1,3-偶极环加成反应,对环氧乙烷1和4进行热处理,得到2 H,4 H,9 H-呋喃[3,2- c ] [1]苯并吡喃5和6。环氧乙烷和乙炔部分的开环。