ethyl 4-{[(2S)-2-ethyl-7-methyl-3-oxo-3,4-dihydroquinoxalin-1(2H)-yl]sulfonyl}phenyl carbonate 、
碘乙烷 、 (3S)-3-ethyl-6-fluoro-4-[(4-hydroxyphenyl)sulfonyl]-1-propyl-3,4-dihydroquinoxalin-2(1H)-one 以
二甲基亚砜 为溶剂,
以to yield (3S)-1,3-diethyl-4-[(4-hydroxyphenyl)sulfonyl]-6-methyl-3,4-dihydroquinoxalin-2(1H)-one [α]D25=−118° (c=0.0054 G/ML, DMSO)的产率得到(3S)-1,3-diethyl-4-[(4-hydroxyphenyl)sulfonyl]-6-methyl-3,4-dihydroquinoxalin-2(1H)-one