A Novel Furan Ring Construction and Syntheses of 4- and 4,5-Substituted 2-(.alpha.-Heterocyclylalkyl)furans
作者:Alan R. Katritzky、Jianqing Li
DOI:10.1021/jo00108a028
日期:1995.2
4-Substituted and 4,5-disubstituted 2-(benzotriazol-1-ylmethyl)furans 3 have been prepared in good yields from 1-propargylbenzotriazole (1) and alpha-bromo ketones via one-pot processes. The 2(benzotriazol-1-ylmethyl) side chain of 3 was alkylated by lithiation followed by quenching with electrophiles to afford 4- and 4,5-substituted 2-(alpha-benzotriazol-1-ylalkyl)furans 11. Substitution of the benzotriazolyl groups of 3 and 11 with other heterocycles in the presence of ZnClB2 gave a variety of 4- and 4,5-substituted 2-(alpha-heterocycloalkyl)furans 10 and 12 in good yields.