tert-butyl N-[(4R,4aS,7aS)-4-[5-[(5-cyanopyridine-2-carbonyl)amino]-2-fluorophenyl]-4-ethynyl-4a,5,7,7a-tetrahydrofuro[3,4-e][1,3]oxazin-2-yl]-N-[(2-methylpropan-2-yl)oxycarbonyl]carbamate 在
甲酸 作用下,
反应 3.5h,
以79%的产率得到N-[3-[(4R,4aS,7aS)-2-amino-4-ethynyl-4a,5,7,7a-tetrahydrofuro[3,4-e][1,3]oxazin-4-yl]-4-fluorophenyl]-5-cyanopyridine-2-carboxamide