Synthesis of the calophyllum coumarins

Article abstract of DOI:10.1016/S0040-4039(00)73500-3

Synthetic routes leading to the synthesis of the natural 4-alkyl and 4- phenyl coumarins isolated from Calophyllum sp. are reported. The reported structures of calanolides C and D and oblongutide are incorrect and have been corrected by unambiguous synthesis.