benzyl 4-[[(2S,3R)-1,3-bis[(2-methylpropan-2-yl)oxy]-1-oxobutan-2-yl]carbamoyl]-3-(hydroxymethyl)piperazine-1-carboxylate 在
吡啶 、
甲基磺酰氯 作用下,
以
二氯甲烷 为溶剂,
以90%的产率得到benzyl 2-[(2S,3R)-1,3-bis[(2-methylpropan-2-yl)oxy]-1-oxobutan-2-yl]-3-oxo-5,6,8,8a-tetrahydro-1H-imidazo[1,5-a]pyrazine-7-carboxylate