Rhodium(II)-catalyzed reactions of 3-diazo-2,4-chromenediones. First one-step synthesis of pterophyllin 2
作者:Yong Rok Lee、Jung Yup Suk、Byung So Kim
DOI:10.1016/s0040-4039(99)01317-9
日期:1999.9
described. Reactions of 1 with nitriles, isocyanates, and ketones give the corresponding 5-membered heterocycles in moderate yields, whereas those of 1 with acid chlorides afford α-chloroenones in moderate yields. Reactions of 1 with electron-rich and -deficient olefins such as vinyl ethers and allyl iodide give dihydrofurocoumarins as a single compound, whereas those of 3 with vinyl esters afford either angular
本文描述了铑(II)催化的3-重氮-2,4-氧化铬1-3与各种底物的反应。的反应1与腈类,异氰酸酯,和酮,得到相应的5-元杂环在中等产率,而那些的1与酰氯得到α-chloroenones在中等产率。的反应1与富电子和缺陷型的烯烃如乙烯基醚和烯丙基碘给予dihydrofurocoumarins作为单一化合物,而那些的3与乙烯基酯得到任一角度dihydrofurocoumarin和线性产物或重排的产物,为异构体。此外,该新方法已应用于合成自叶绿素2分离的天然pterophyllin 2。翼状叶蕨。