Compound 8 was reacted with 7 in the presence of potassium tert-butoxide to give the condensation product (9), which was reduced with lithium borohydride to afford a mixture of alcohols (10a, b). The alcohols underwent cyclization with concentrated hydrochloric acid to furnish propacin (1). Its regioisomer (3) was also synthesized from the condensation product (13) through a similar route.
化合物8与7在存在叔丁氧化
钾的情况下反应,生成缩合产物(9),随后用
氢化铝锂还原,得到一混合醇(10a,b)。这些醇与浓
盐酸发生环化反应,生成
丙酸(1)。其区位异构体(3)也通过类似途径从缩合产物(13)合成。