The reactions of 2-amino-4,5-dihydro-3-furancarboxarnides 1a,b with cyanomethylene compounds (such as alkyl cyanoacetates and malononitrile) gave the corresponding ring-opened products 2a-f. Compounds 2a-d reacted with methanesulfonic acid to give the corresponding α-alkylidene-γ-butyrolactones 3a-d. On the other hand, treatment of 2e,f with methanesulfonic acid yielded 3-pyridinecarbonitrile derivatives
2-
氨基-4,5-二氢-3-
呋喃甲酰胺1a,b与
氰基亚甲基化合物(例如
氰基
乙酸烷基酯和
丙二腈)反应,得到相应的开环产物2a-f。化合物2a-d与
甲磺酸反应,得到相应的α-亚烷基-
γ-丁内酯3a-d。另一方面,用
甲磺酸处理2e,f得到3-
吡啶甲腈衍
生物4a,b。