New Synthesis of 2-Oxo-3-alkenylphosphonates and Hetero Diels–Alder Reactions with Vinyl Ethers Leading to 5-Substituted 2-Phosphiny 1-2-cyclohexen-1-ones
作者:Eiji Wada、Shuji Kanemasa、Otohiko Tsuge
DOI:10.1246/bcsj.62.860
日期:1989.3
A new method of synthesizing phosphinyl-substituted enones, 2-oxo-3-alkenylphosphonates, is developed via the dianion of diethyl 2-oxopropylphosphonate. The enones serve as hetero dienes in thermal reactions with vinly ethers producing 2-alkoxy-6-(phosphinylmethyl)-3,4-dihydro-2H-pyrans. Acid-catalyzed cleavage of these cycloadducts is followed spontaneously by internal condensation furnishing 2-p
通过 2-氧代丙基膦酸二乙酯的二价阴离子,开发了一种合成膦酰基取代的烯酮、2-氧代-3-烯基膦酸酯的新方法。烯酮在与乙烯基醚的热反应中用作杂二烯,产生 2-烷氧基-6-(膦基甲基)-3,4-二氢-2H-吡喃。这些环加合物的酸催化裂解随后自发地进行内部缩合,提供 2-phosphinyl-2-cyclohexen-1-one 衍生物。