Lewis acid mediated nucleophilic substitution reactions of 2-alkoxy-3,4-dihydro-2H-1-benzopyrans: regiochemistry and utility in the synthesis of 3,4-dihydro-2H-1-benzopyran-2-carboxylic acids
摘要:
DOI:
10.1021/jo00275a010
作为产物:
描述:
特丁基对苯二酚 、 丁烯酮 、 乙醚 以
petroleum ether 为溶剂,
以gave (±)-7-tert-butyl-6-hydroxy-2-methoxy-2-methylchroman as a white solid, m.p. 115°-117° from ether-30°-60° petroleum ether的产率得到7-tert-Butyl-2-methoxy-2-methyl-chroman-6-ol