A titanium (IV) mediated one-pot double condensation synthesis of 5,6-dihydro-4H-pyran-4-ones
作者:Joel Morris、Donn G. Wishka、George P. Luke、Thomas M. Judge、Ronald B. Gammill
DOI:10.1016/s0040-4020(97)00378-5
日期:1997.8
is described. This preparation makes use of the condensation of titanium enolates derived from β-hydroxy ketones with phosgene iminium chloride or trimethylorthoformate, respectively. The in situ formation of the necessary titanium complex from an aldol condensation using simple ketone and aldehyde precursors makes for a one-pot double condensation synthesis of the desired dihydropyrones.
描述了合成2-氨基-5,6-二氢-4 H-吡喃-4-酮和5,6-二氢-4 H-吡喃-4-酮的替代方法。该制备方法利用了衍生自β-羟基酮的烯醇钛酸酯与光气氯化亚胺氯化铵或原甲酸三甲酯的缩合反应。在原位形成了必要的钛从使用简单的酮和醛前体的醛醇缩合复杂的使得所希望的dihydropyrones一锅双缩合合成。