Noble N-substituted-3-fluoropyrroles derivatives were prepared from new precursor via ring formation. The addition reaction of ethyl iododifluoroacetate to vinyl trimethylsilane under the Cu(0) catalyst resulted in the formation of ethyl-2,2-difluoro-4-iodo-4-(trimethylsilyl)butanolate, which reacted with diisobutylaluminium hydride at $-30^\circ}C$ to yield 2,2-diflouro-4-iodo-4-(trimethylsilyl)butanal. Finally, a series of N-substituted-3-fluoropyrrole derivatives were synthesized by the reaction of 2,2-diflouro-4-iodo-4-(trimethylsilyl)butanal with $NH_4OH$ or primary amines followed by reaction with KF solution.
利用新的前体通过成环法制备了高尚的 N-取代-3-
氟吡咯衍
生物。在 Cu(0) 催化剂作用下,
碘-
二氟乙酸乙酯与
乙烯基三甲基
硅烷发生加成反应,生成 2,2-二
氟-4-
碘-4-(三甲基
硅基)
丁醇乙酯,该
乙酯与
二异丁基氢化铝在
$-30^\circ}C$ 下反应生成 2,2-二
氟-4-
碘-4-(三甲基
硅基)
丁醛。最后,2,2-二
氟-4-
碘-4-(三甲基
硅基)
丁醛与
$NH_4OH$ 或
伯胺反应,然后与 KF 溶液反应,合成了一系列 N-取代的-3-
氟吡咯衍
生物。