Synthesis of five- and six-membered heterocycles by dimethyl carbonate with catalytic amounts of nitrogen bicyclic bases
作者:F. Aricò、S. Evaristo、P. Tundo
DOI:10.1039/c4gc01822b
日期:——
A catalytic amount of a nitrogen bicyclic base, i.e., DABCO, DBU or TBD, is effective for the one-pot synthesis of heterocycles from 1,4-, 1,5-diols and 1,4-bifunctional compounds via dimethyl carbonate chemistry under neat conditions. Nitrogen bicyclic bases that were previously shown to have enhanced the reactivity of DMC in methoxycarbonylation reaction by a BAc2 mechanism are herein used for the
氮双环碱,催化量的即,DABCO,DBU或TBD,有效用于从所述1,4-一锅合成杂环的,1,5-二醇和1,4-双官能化合物通过下碳酸二甲酯化学整洁的条件。先前显示通过B Ac 2机理增强了DMC在甲氧基羰基化反应中的反应性的氮双环碱在本文中首次用作涵盖B Ac 2和B Al 2途径的环化反应的有效催化剂。从D-山梨糖醇和D开始,该合成方法也适用于环糖,异山梨醇和异甘露糖苷的大规模合成。-甘露醇。得到的无水糖醇为纯净的结晶化合物,不需要任何进一步的纯化或结晶。