作者:Dani Sánchez、David Bastida、Jordi Burés、Carles Isart、Oriol Pineda、Jaume Vilarrasa
DOI:10.1021/ol203157s
日期:2012.1.20
Equilibria between carbonyl compounds and their enamines (from O-TBDPS-derived prolinol) have been examined by NMR spectroscopy in DMSO-d6. By comparing the exchange reactions between pairs (enamine A + carbonyl B → carbonyl A + enamine B), a quite general scale of the tendency of carbonyl groups to form enamines has been established. Aldehydes quickly give enamines that are relatively more stable
羰基化合物及其烯胺(来自O -TBDPS的脯氨醇)之间的平衡已通过DMSO- d 6中的NMR光谱法进行了检查。通过比较对之间的交换反应(烯胺A +羰基B→羰基A +烯胺B),已确定了羰基形成烯胺趋势的相当普遍的规模。醛很快会产生比酮相对稳定的烯胺,但该预期规则有例外;例如,1,3-二羟基丙酮缩醛或3,5-二氧杂环己酮(2-苯基-1,3-二氧杂-5-酮和2,2-二甲基-1,3-二氧杂-5-酮)表现出更大的趋势比许多α-取代的醛能得到烯胺。