methyl (1R,2S,5S)-3-[(2S)-2-[[(2S)-1-(1,1-dioxo-1,2,5-thiadiazolidin-2-yl)-3,3-dimethylbutan-2-yl]carbamoylamino]-3,3-dimethylbutanoyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxylate 、
碘甲烷 在
caesium carbonate 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
以95%的产率得到methyl (1R,2S,5S)-3-[(2S)-2-[[(2S)-3,3-dimethyl-1-(5-methyl-1,1-dioxo-1,2,5-thiadiazolidin-2-yl)butan-2-yl]carbamoylamino]-3,3-dimethylbutanoyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxylate