N-Iminopyridinium YlideとEthyl β-ChloroisocrotonateよりPyrazolo-[1,5-α]pyridine誘導体の生成反応
1971 年 91 巻 11 号 p. 1154-1157
詳細
1971 年 91 巻 11 号 p. 1154-1157
N-Iminopyridinium ylides (IV) were found to react readily with ethyl β-chloroisocrotonate (Va) (or ethyl acetoacetate (Vb)) to give ethyl 2-methy1pyrazo1o [1, 5-α] pyridine-3-carboxylates (VI). The reaction of IV with Va can be explained in terms of the 1, 3-dipolar cycloaddition reaction.
