oxazolidin-2-ylidene-acetic acid ethyl ester 、
2-<1-(2-nitrobenzylidene)acetonyl>-2-oxo-1,3,2-dioxaphosphorinane 以
乙腈 为溶剂,
反应 10.0h,
以38%的产率得到5-Methyl-7-(2-nitro-phenyl)-6-(2-oxo-2λ
5-[1,3,2]dioxaphosphinan-2-yl)-2,3-dihydro-7H-oxazolo[3,2-a]pyridine-8-carboxylic acid ethyl ester