An Improved Procedure for the Preparation of Substituted Thiazoles
作者:Maria Teresa Cocco、Valentina Onnis
DOI:10.1055/s-1993-25827
日期:——
The reaction between 3-amino-3-(dialkylamino)propenenitriles 1 and sodium thiocyanate in presence of bromine, provides an efficient route for the synthesis of 2-amino-5-cyano-4-(dialkylamino)thiazoles 3.
A convenientsynthesis of 4-amino-7-(dialkylamino)pyrido[2,3-d]pyrimidines via cyclization of functionalized pyridines is reported. The preparation of the starting pyridinesfrom 3-amino-3-(dialkylaraino)propene-nitriles and ethoxymethylenemalononitrile is described.
据报道,通过官能化吡啶的环化,可以方便地合成4-氨基-7-(二烷基氨基)吡啶并[2,3- d ]嘧啶。描述了由3-氨基-3-(二烷基芳基)丙烯腈和乙氧基亚甲基丙二腈制备起始吡啶的方法。
Synthesis of Some New 2(1<i>H</i>)-Pyridones from 3-Amino-3-(dialkylamino)propenenitriles
3-Amino-3-(dialkylamino)propenenitriles were reacted with acetylenecarboxylates to give 2(1H)-pyridone derivatives. The reaction with ethyl propynate afforded dienamino ester intermediates which cyclized in sodium ethoxide/ethanol to 5-cyano-2(1H)-pyridone. The reaction with diethyl acetylenedicarboxylate gave directly the 2(1H)-pyridone derivatives.