Synthesis of 6-carboxy-2,2-dimethylchromans and chromenes
作者:V.K. Ahluwalia、R.S. Jolly、A.K. Tehim
DOI:10.1016/0040-4020(82)80076-8
日期:1982.1
The condensation of hydroxybenzoic acids and their methyl esters with isoprene in the presence of orthophosphoric acid gives corresponding 2,2-dimethylchromans, which can be dehydrogenated with DDQ or NBS to give the corresponding 6-carboxy-2,2-dimethylchromenes. The synthesis of β-tubaic acid, a natural compound, has also been achieved.