A new and efficient route to 7-ethyl-1H-furo[2,3-g]indazole (2) has been developed. Treatment of 4,5-dihydro-7-(1-hydroxyethyl)indazole (12) with hydrochloric acid in ethanol resulted in a concomitant dehydration and aromatization to afford the title compound in good yield.
A concise new synthesis of angular furanocoumarins: Angelicin, oroselone & oroselol
作者:Yong Rok Lee
DOI:10.1016/0040-4020(95)00070-o
日期:1995.3
An efficient synthesis of angular furanocoumarins has been carried out starting from dihydrobenzofuran derivatives.