Preparation of 2-Alkyl- and 2-Acylpropenals from 5-(Trifluoromethanesulfonyloxy)-4H-1,3-dioxin: A Versatile Acrolein α-Cation Synthon
作者:Stephen P. Fearnley、Raymond L. Funk、Robert J. Gregg
DOI:10.1016/s0040-4020(00)00872-3
日期:2000.12
catalyzed cross-coupling reactions to provide 5-substituted-4H-1,3-dioxins 5. Upon thermolysis, these compounds undergo facile retrocycloaddition reactions to generate the corresponding 2-substituted acroleins which, if necessary, can be trapped in situ with dienes or heterodienophiles. In particular, the heretofore unknown 2-acylacroleins can be generated using this methodology and trapped with enol ethers
5-(三氟甲磺酰氧基)-4 H -1,3-二恶英(3)参与各种与铜酸盐试剂的亲核取代反应,或参与钯催化的交叉偶联反应以提供5-取代的4 H -1,3-二恶英5。在热解后,这些化合物进行容易的逆转录加成反应以生成相应的2-取代的丙烯醛,如果需要的话,可以将其与二烯或异二烯体原位捕获。特别地,可以使用该方法产生迄今未知的2-酰基丙烯醛,并用烯醇醚捕集以提供5-酰基-3,4-二氢-2 H-吡喃(6g,h),这是许多天然产物共有的亚结构单元。