A novel method for the construction of 1-azaspirocycles from 5-alkyl-/-arylamine furylcarbinols though intramolecular aza-Piancatelli rearrangement was developed. By using PPh3/diethyl azodicarboxylate instead of a Lewis acid, 1-azaspirocyclic compounds were obtained in good yields and the reaction temperature was reduced to room temperature. In addition, substrates with groups that are sensitive to
通过分子内氮杂-Piancatelli重排,从5-烷基-/-芳基胺
呋喃基
甲醇构建1-azaspirocycles的一种新方法被开发。通过使用PPh 3 /偶氮二
羧酸二
乙酯代替
路易斯酸,以良好的收率获得了1-氮杂
螺环化合物,并且将反应温度降低至室温。此外,在这些反应条件下可耐受具有对高温或
路易斯酸敏感的基团的底物。这是不仅适用于具有更高产率的5-(N-芳基
氨基烷基)
呋喃基
甲醇,而且适用于5-(N-烷基
氨基烷基)
呋喃基
甲醇的第一种方法。