An Unequivocal Synthesis of the Ring-A,B Dihydropyrromethenone of Phytochrome

Article abstract of DOI:10.1016/0040-4039(95)00032-8

Dihydropyrromethenone 1b (R= p-methoxybenzyl), a potential precursor for the synthesis of phytochrome (3), has been prepared in enantiomerically pure form beginning with the homochiral acetylenic lactone 18.