作者:Stylianos Hamilakis、Demetrios Kontonassios、Constantine Sandris
DOI:10.1002/jhet.5570330347
日期:1996.5
Meldrum's acid has been found to be effectively acylated using the imidazolides of N-protected glycines, X-NHCH2COOH (X = -COPh, -COMe, -Z, -Boc, -COOMe and -COOEt). The corresponding C-acylation compounds were isolated in high yields and were readily converted to the N-protected tetramic acids. It was shown by pmr spectroscopy that these acids exist as the enol tautomers in DMSO-d6 solution, whereas
已发现使用N-保护的甘氨酸的咪唑化物,X-NHCH 2 COOH(X = -COPh,-COMe,-Z,-Boc,-COOMe和-COOEt)可有效地使麦德鲁姆酸酰化。相应的C-酰化化合物以高收率分离,并易于转化为N-保护的四酸。pmr光谱表明,这些酸在DMSO-d 6溶液中以烯醇互变异构体的形式存在,而在氘代氯仿溶液中,烯醇和酮互变异构体均可以观察到。