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Cyclocondensation of acetylenic amides with triethylorthoformate and triethylorthoacetate in boiling glacial acetic acid under nitrogen gave 3‐propynylquinazolinones. 2‐Ethoxy‐2‐methyl‐3[1,1‐dimethylpropynyl]quinazolin‐4(1H,3H)‐one (3b) and 2‐ethoxy‐2‐methyl‐3‐[1‐cyclohexylpropynyl]quinazolin‐4(1H,3H)‐one (3c) in refluxing ethanolic sodium hydroxide afforded the corresponding oxazoloquinazolinones.
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Reisch et al. (1990) studied this question.
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