作者:K. C. Majumdar、P. Chatterjee、A. K. Kundu
DOI:10.1080/00397919608004643
日期:1996.9
A number of ortho-cyclohexenyl phenols 2(a-i) have been cyclised by treatment with one equivalent of m-chloroperoxybenzoic acid in refluxing benzene for 4 h to furnish linearly fused 1-hydroxy-1,2,3,4,4a,9a-hexahydrodibenzofurans 3 (a-i) (70-80%) and bicyclic 3-hydroxy-1,3-ethanochromans 4(a-f) (10-20%). Products 3(a-i) were oxidised with 2,3-dichloro-5,6-dicyano-1 ,4-benzoquinone (excess) in refluxing dry xylene for 6 h to give 2,3-dihydrodibenzofuran-1 (2H)-ones 6(a-i) (85-95%).