3aR-benzyl-2-methyl-4,5,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridin-3(3aH)-one 、
3(R)-benzyloxy-2-(2-tert-butoxycarbonylamino-2-methyl-propionyl-amino)-propionic acid 在
3(R)-benzyloxy-2-(2-tert-butoxycarbonylamino-2-methyl-propionyl-amino)-propionic acid 作用下,
以95的产率得到tert-butyl N-[1-[[(2R)-1-(3a-benzyl-2-methyl-3-oxo-6,7-dihydro-4H-pyrazolo[4,3-c]pyridin-5-yl)-1-oxo-3-phenylmethoxypropan-2-yl]amino]-2-methyl-1-oxopropan-2-yl]carbamate