Protecting Group Free Synthesis of Carboxyl-substituted Dihydropyrimidines Through Biginelli Reaction
作者:Eugeniy N. Ostapchuk、Andrey S. Plaskon、Oleksandr O. Grygorenko、Andrey A. Tolmachev、Sergey V. Ryabukhin
DOI:10.1002/jhet.1568
日期:2013.11
acetoacetic acid derivatives, and various carboxyl‐containing ureas was explored. It was found that the steric load of the urea substituents influenced strongly the reaction outcome; in particular, the method was efficient only in the case of unbranched mono‐substituted ureas bearing either aliphatic or aromaticgroups. The method allows performing a one‐pot, protectinggroup free synthesis of dihydropyrimidines
Synthesis of structurally diverse 3,4-dihydropyrimidin-2(1<i>H</i>)-ones via sequential Biginelli and Passerini reactions
作者:Andreas C Boukis、Baptiste Monney、Michael A R Meier
DOI:10.3762/bjoc.13.7
日期:——
Biginelli reaction was combined with the Passerini reaction for the first time in a sequential multicomponent tandemreaction approach. After evaluation of all possible linker components and a suitable solvent system, highly functionalized dihydropyrimidone-alpha-acyloxycarboxamide compounds were obtained in good to excellent yields. In a first reaction step, different 3,4-dihydropyrimidin-2(1H)-one acids