(S,S)-4,5-bis(2-methylphenyl)-2-methylene-1,3-dioxolane 、
benzyl 3-acetylamino-2-(1-oxoethyl)prop-2-enoate 以
四氢呋喃 为溶剂,
生成 benzyl 4-acetylamino-5,6-dihydro-2-methyl-4'S,5'S-bis(2-methylphenyl)spiro[4H-pyran-6,2'-[1,3]dioxolan]-3-carboxylate 、 benzyl 4-acetylamino-5,6-dihydro-2-methyl-4'S,5'S-bis(2-methylphenyl)spiro[4H-pyran-6,2'-[1,3]dioxolan]-3-carboxylate