Studies on sigmatropic rearrangements: Thermal rearrangement of 3-(meta-substituted aryloxymethyl) coumarins
作者:K. C. Majumdar、G. H. Jana、S. K. Ghosh、S. Saha
DOI:10.1007/bf00807595
日期:——
At elevated temperatures, the 3-(meta-substituted aryloxymethyl) coumarins 3a-e and 3g-k undergo sigmatropic rearrangements to give the hydroxylated 3-benzylcoumarins 4a-e and 4g-k. Upon methylation and subsequent oxidation with N-bromo succinimide, the 3-(chlorosubstituted benzyl) coumarins 4a, 4m and 4n afford 3-(chlorosubstituted benzoyl) coumarins 8a, 8m, and 8n.