The synthesis of mannich bases from ketones and esters via enaminones.
作者:Paul Francis Schuda、Cynthia B. Ebner、Tina M. Morgan
DOI:10.1016/s0040-4039(00)84586-4
日期:1986.1
The reactions of a series of activated methylene compounds with amide acetals to form high yields of enaminones is described. Further conversion to the Mannich Bases via reduction with lithium aluminum hydride is also covered.
Two simple procedures for the selective protection of the ring N of aminopyrazoles as tert-butoxycarbamate (Boc) in high yields are reported; several other protecting groups (Cbz, Bn, SEM) can be introduced using the one-pot procedure (method B). The N-Boc protected aminopyrazoles are acylated at the exocyclic NH2 group and subsequently deprotected to give the corresponding 3-acylaminopyrazoles in