(+/-)-5-(2-Ethyl-7-methyl-4H-benzo[5,6]cyclohepta[1,2-d]oxazol-4-yl)-2,4(1H,3H)-pyrimidinedione 、
2-(bromomethyl)-4-carbethoxy-1,3-oxazole 在
乙酸乙酯 、
甲苯 作用下,
生成 (+/-)-2-[[5-(2-Ethyl-7-methyl-4H-benzo[5,6]cyclohepta[1,2-d]oxazol-4-yl)-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl]methyl]-4-oxazolecarboxylic acid, ethyl ester