A furan ring expansion approach to the synthesis of novel pyridazino-psoralen derivatives
作者:José C. González-Gómez、Lourdes Santana、Eugenio Uriarte
DOI:10.1016/j.tet.2005.03.018
日期:2005.5
A convenient preparation of the parent tetrahydrobenzodifuran 2 was developed from resorcinol. The oxidation of one or both furan rings of this key intermediate was accomplished with DDQ and the resulting benzodifuran was subsequently reacted with 3,6-dimethoxycarbonyl-1,2,4,5-tetrazine to afford the expected pyridazino-psoralen derivative in good yield. This simple method allowed the efficient preparation