Synthesis of γ-N-acylamino-β-keto esters and ethyl 5-oxazoleacetates via Ritter reaction and hydration of γ-hydroxy-α,β-alkynoic esters
作者:K. Srinivasa Rao、D. Srinivasa Reddy、Manojit Pal、K. Mukkanti、Javed Iqbal
DOI:10.1016/j.tetlet.2006.04.092
日期:2006.6
The classical Ritter reaction on γ-hydroxy-α,β-alkynoic esters produced γ-N-acylamino-β-keto esters or ethyl 5-oxazoleacetates using alkyl or aryl nitriles, respectively. The γ-N-acylamino-β-keto esters resulting from alkyl nitriles are useful intermediates in the synthesis of a variety of building blocks. We also show that these can be converted into ethyl 5-oxazoleacetates using an additional step
在γ-羟基-α,β-炔基酯上进行的经典Ritter反应分别使用烷基或芳基腈生成γ- N-酰基氨基-β-酮酸酯或5-恶唑乙酸乙酯。由烷基腈产生的γ- N-酰基氨基-β-酮酸酯是合成各种结构单元的有用中间体。我们还表明,可以使用涉及POCl 3的附加步骤将它们转化为5-恶唑乙酸乙酯。