(+/-)-6-Methyl-2,4-dioxo-α-phenyl-3,6-diazabicyclo<3.1.0>hexane-3-acetic acid methyl ester 、
(R)-(-)-丙烯酰-2,10-樟脑磺内酰胺 以
1,4-二氧六环 为溶剂,
以61%的产率得到methyl 2-[(1S,5R,6S)-6-[(1S,5R,7R)-10,10-dimethyl-3,3-dioxo-3λ6-thia-4-azatricyclo[5.2.1.01,5]decane-4-carbonyl]-8-methyl-2,4-dioxo-3,8-diazabicyclo[3.2.1]octan-3-yl]-2-phenylacetate