6-methyl-1,3-dioxo-1,2,3,3a,4,5,6,8b-octahydro-2,6-diaza-as-indacene-4-carboxylic acid benzyl ester 在
manganese dioxide Dioxane Methanol 、 ethyl acetate petroleum ether 作用下,
以
1,4-二氧六环 为溶剂,
反应 2.0h,
以gave the title compound (1.10 g, 27%), which的产率得到6-methyl-1,3-dioxo-1,2,3,6-tetrahydro-2,6-diaza-as-indacene-4-carboxylic acid benzyl ester