[(1S)-2-[(1S,3S,5S)-3-cyano-2-azabicyclo[3.1.0]hex-2-yl]-1-(3-hydroxy-tricyclo[3.3.1.13,7]dec-1-yl)-2-oxoethyl]-carbamic acid 1,1-dimethyl-ethyl ester

[(1S)-2-[(1S,3S,5S)-3-cyano-2-azabicyclo[3.1.0]hex-2-yl]-1-(3-hydroxytricyclo [3.3.1.13,7]dec-1-yl)-2-oxoethyl] carbamic acid-1,1-dimethylethyl ester

(1S,3S,5S)-2-[(2S)-2-[(1,1-dimethoxy)carbonyl]amino-2-(3-hydroxy-1-adamantyl)acetyl]-2-azabicyclo[3.1.0]hexane-3-carbonitrile

Boc-saxagliptin

tert-Butyl [(1S)-2-[(1S,3S,5S)-3-cyano-2-azabicyclo[3.1.0]hex-2-yl]-1-(3-hydroxyadamantan-1-yl)-2-oxoethyl]carbamate

Carbamic

Boc-saxagliptin

Saxagliptin Intermediate 4

N-[(1S)-2-[(1S,3S,5S)-3-Cyano-2-azabicyclo[3.1.0]hex-2-yl]-1-(3-hydroxytricyclo[3.3.1.13,7]dec-1-yl)-2-oxoethyl]carbamic acid 1,1-dimethylethyl ester

Carbamic

Boc-saxagliptin

Saxagliptin Intermediate 4

N-[(1S)-2-[(1S,3S,5S)-3-Cyano-2-azabicyclo[3.1.0]hex-2-yl]-1-(3-hydroxytricyclo[3.3.1.13,7]dec-1-yl)-2-oxoethyl]carbamic acid 1,1-dimethylethyl ester