{(S)-2-Methyl-1-[(2S,5S)-2-methyl-5-((2S,4R)-4-methyl-5-oxo-tetrahydro-furan-2-yl)-3-oxo-[1,4]diazecane-1-carbonyl]-propyl}-carbamic acid tert-butyl ester 、
(S)-2-Amino-3-methyl-N-pyridin-4-ylmethyl-butyramide 在
2-羟基吡啶 作用下,
生成 {(S)-1-[(2S,5S)-5-((1S,3R)-1-Hydroxy-3-{(S)-2-methyl-1-[(pyridin-4-ylmethyl)-carbamoyl]-propylcarbamoyl}-butyl)-2-methyl-3-oxo-[1,4]diazecane-1-carbonyl]-2-methyl-propyl}-carbamic acid tert-butyl ester