(±)-tert-butyl 5-(3-aminopyridin-4-yl)-7-methyl-2-oxohexahydrobenzo[d]oxazole-3(2H)-carboxylate 、
N,N'-硫羰基二咪唑 在
SiO2 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以(3aR,5R,7S,7aS)-tert-butyl 5-(3-isothiocyanatopyridin-4-yl)-7-methyl-2-oxohexahydrobenzo[d]oxazole-3(2H)-carboxylate is obtained的产率得到(3aR,5R,7S,7aS)-tert-butyl 5-(3-isothiocyanatopyridin-4-yl)-7-methyl-2-oxohexahydrobenzo[d]oxazole-3(2H)-carboxylate