Two practical and efficient approaches have been implemented as alternative procedures for the synthesis of naftifine and novel diversely substituted analogues 16 and 20 in good to excellent yields, mediated by Mannich-type reactions as the key step of the processes. In these approaches, the γ-aminoalcohols 15 and 19 were obtained as the key intermediates and their subsequent dehydration catalyzed
A facile synthesis of stable β-amino-N-/O-hemiacetals through a catalyst-free three-component Mannich-type reaction
作者:Rodrigo Abonia、Juan C. Castillo、Alexander Garay、Braulio Insuasty、Jairo Quiroga、Manuel Nogueras、Justo Cobo、Richard D'Vries
DOI:10.1016/j.tetlet.2017.02.084
日期:2017.4
compounds were obtained in good to excellent yields through an uncatalyzed three-component reaction by treatment of secondary amines with polyformaldehyde and electron-rich alkenes in acetonitrile as solvent at ambient temperature. The reactions proceeded with the formation of iminium ions, through a Mannich-typereaction, as the key intermediates for the generation of the target products. Single crystal