异氰酸苯酯 、 6,7-Dihydro-1-(4-methylphenylsulfonyl)-2-(triphenylphosphoranylidenamino)-1H-azepin-3,5-dicarbonsaeure-5-ethylester-3-methylester 以
乙腈 为溶剂,
反应 4.0h,
以92%的产率得到4,7,8,9-Tetrahydro-2-methoxy-9-(4-methylphenylsulfonyl)-4-oxo-3-phenyl-3H-pyrimido<4.5-b>azepin-6-carbonsaeure-ethylester