(3aS,5R/S,7aR)-7-(2-bromo-acetyl)-5-methoxy-hexahydro-2,4-dioxa-7-aza-inden-1-one 、
苄胺 以
甲醇 为溶剂,
生成
(1R,3R,9aS)-8-benzyl-1-hydroxymethyl-3-methoxy-hexahydro-pyrazino[2,1-c][1,4]oxazine-6,9-dione 、 (1R,3S,9aS)-8-benzyl-1-hydroxymethyl-3-methoxy-hexahydro-pyrazino[2,1-c][1,4]oxazine-6,9-dione