A number of new methylderivatives of pyranocoumarins, related to 8-desmethylxanthyletine and to 8-desmethylseseline, were synthesized. The syntheses were performed by cyclization in boiling N,N-diethyl aniline of the propargyl or methylpropargyl ethers of the appropriate methylderivatives of 7-hydroxycou-marin. Methyl groups have been introduced into positions which look most promising for enhancement
Microwave Promoted and Improved Thermal Synthesis of Pyranocoumarins and Furocoumarins
作者:Mohammad R. Saidi、Kamal Bigdeli
DOI:10.1039/a805913f
日期:——
Propargyl ethers of 7-hydroxy-, 4-hydroxy-, and 4-methyl-7-hydroxycoumarins have been efficiently rearranged to pyranocoumarins and furocoumarins under microwave irradiation; improved thermal rearrangement of these ethers was also reported.