Synthesis of (2S,4R,5R)-4,5,6-Trihydroxynorleucine and 5-Hydroxynorvaline from precursors obtained by an unusual rearrangement in a 5,6-dihydro-2-pyrone
作者:Alejandro P. Nin、Rosa M. de Lederkremer、Oscar Varela
DOI:10.1016/0040-4020(96)00767-3
日期:1996.9
6-O-benzylidene-2,3-dideoxy-d-erythro-hex-2-enono-1,5-lactone (2), readily prepared from d-glucosamine, undergoes a rearrangement on treatment with tin(IV) chloride which leads to 3-acetamido-2-pyrone (3) and 2-acetamido-2,3-dideoxy-4,6-O-formylidene-d-threo-hex-2-enono-1,5-lactone (4). A mechanism is proposed for this unusualrearrangement, which was not observed for other analogous hex-2-enono-1,5-lactones. For