ethyl 2-formylbutanoate 、 (S)-5-(2',3'-dimethylbiphenyl-4-yloxymethyl)-4,5-dihydro-oxazol-2-ylamine toluene-4-sulfonic acid (S)-7-oxo-2,3-dioxazolo[3,2-a]pyrimidin-2-ylmethyl ester 以
乙醇 为溶剂,
反应 20.0h,
以19%的产率得到(S)-2-(2',3'-dimethylbiphenyl-4-yloxymethyl)-6-ethyl-2,3-dihydro-oxazolo[3,2-a]pyrimidin-7-one