A high yield new synthesis of 2-(2-furyl)-cycloalkanones is described. The first step consists in a condensation of 2,5-dimethoxy-2,5-dihydro-furan with various cyclic β-ketoesters in acidic medium. The decarboalkoxylation is then realised in the presence of lithium chloride and in a polar aprotic solvent according a modified Krapcho reaction. This synthesis is extended to cyclopentanone, cyclohexanone
描述了2-(2-
呋喃基)-环烷酮的高产率新合成。第一步是将2,5-二甲氧基-2,5-二氢
呋喃与各种环状β-
酮酸酯在酸性介质中缩合。然后根据修饰的Krapcho反应,在
氯化锂的存在下和在极性非质子溶剂中实现脱碳烷氧基化。该合成扩展到
环戊酮,
环己酮,四氢
萘酮-1(简单的6-甲氧基化或6,7-甲氧基化),二甲氧基-5,6-甲基-3
茚满酮-1和苯并亚砜-1β-
酮酸酯。