(3S,6S,7S,8aS)-6-(1,3-benzodioxol-5-yl)-2,3,7-trimethyl-1,4-dioxo-3,6,8,8a-tetrahydropyrrolo[1,2-a]pyrazine-7-carbonitrile 在
1,2,3,4,5,6,7,8-八硫杂环辛烷 、
sodium hexamethyldisilazane 作用下,
以32%的产率得到(3S,6S,7S,8aS)-6-(benzo[d][1,3]dioxol-5-yl)-2,3,7-trimethyl-1,4-dioxohexahydro-6H-3,8a-epidithiopyrrolo[1,2-a]pyrazine-7-carbonitrile