马来酸酐 、
cis-N-tosyl-4-(2-carbomethoxyethen-1-yl)-3-methyl-2-azabicyclo<3.3.0>oct-3-ene 以
苯 为溶剂,
反应 44.0h,
以39%的产率得到(5bR,8aR)-9a-Methyl-1,3-dioxo-9-(toluene-4-sulfonyl)-1,3,4,5,5a,5b,6,7,8,8a,9,9a-dodecahydro-2-oxa-9-aza-cyclopenta[b]-as-indacene-4-carboxylic acid methyl ester