(Z)-4-benzylidene-2-(2,5-difluorophenyl)oxazol-5(4H)-one 、
(E)-3-(m-tolyl)acrylaldehyde 在
unpurified residue 作用下,
以to afford 8 as an off-white solid (78 mg, 61%)的产率得到2-(2,5-difluorophenyl)-6-(3-methylbenzyl)-7-phenyl-6,7-dihydropyrano[2,3-d]imidazol-5(3H)-one