硝基甲烷 、
4-Benzyl-2-ethoxycarbonylmethyl-8-formyl-6-methyl-2,3,4,6-tetrahydro-[1,4]oxazino[2,3-f]indole-7-carboxylic acid ethyl ester 在
ammonium acetate 作用下,
反应 2.0h,
以92%的产率得到ethyl 4-benzyl-2-(2-ethoxy-2-oxoethyl)-6-methyl-8-[(E)-2-nitroethenyl]-2,3,4,6-tetrahydro[1,4]oxazino[2,3-f]indole-7-carboxylate