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Acyl-, aroyl-, and heteroaroyl-acetic esters 6a-f and 8a-l are prepared by reactions of 1-acylbenzotriazoles 1a-k with acetoacetic esters 5 or 7a,b in the presence of sodium hydride followed by regioselective deacetylation. Similar C-acylation/deacetylation of acetylacetone and benzoylacetone affords beta-diketones 10a-d and 13a-c, respectively.
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Katritzky et al. (2004) studied this question.
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