The nitroaldol reaction of ketal-functionalized nitroalkanes with α-oxoaldehydes, promoted by Amberlyst A21, followed by acidic treatment (Amberlyst 15) of the obtained nitroalkanol, leads to the formation of 2,5-disubstituted furans in good yields. The procedure was successfully applied to the total synthesis of 1-benzyl-3-(5′-hydroxymethyl-2′-furyl)-indazole (YC-1), an important pharmaceutical target.
在 Amberlyst A21 的促进下,酮官能化的硝基
烷烃与 α-氧代醛发生硝基醛反应,然后对得到的硝基烷醇进行酸处理(Amberlyst 15),从而以良好的收率生成 2,5-二取代
呋喃。该过程被成功应用于 1-苄基-3-(5′-羟甲基-2′-
呋喃基)-
吲唑(YC-1)的全合成,这是一种重要的药物目标物。