Photochemistry of 7-acetoxybenzopyran derivatives. Synthesis of eupatoriochromene and encecalin
作者:Miguel A. Miranda、Jaime Primo、Rosa Tormos
DOI:10.1016/s0040-4020(01)89221-8
日期:1989.1
The photolysis of the 7-acetoxybenzopyran derivatives 1a-5a has been carried out. Chromene 1a was found to undergo extensive photopolymerization. Chromanone 2a underwent a rather inefficient photo-Friesrearrangement to the 6 - and 8 - acetyl derivatives 2b and 2c. Diacetoxychromene 3a gave the unsaturated ketone 8 as the main product, besides its deacetylation analogue 9 and chromanone 11. Diacetoxychroman