amino-containing trisubstituted 2H-pyran-2-ones in good yields. This transformation proceeds via 1) synthesis of an ynenoic ester intermediate by a Sonogashira coupling reaction with an N-substituted (Z)-3-iodovinylic ester; 2) intramolecular iodocyclization of the latter intermediate under mildly basic conditions. The flexibility of this strategy enables the efficient syntheses of a variety of substituted
Sonogashira偶联和
碘环化的一锅序列以高收率提供了新型的含
氨基三取代2 H -pyran -2-ones。通过1)通过与N-取代的(Z)-3-
碘乙烯基酯的Sonogashira偶联反应合成炔属酸酯中间体来进行该转化。2)在温和的碱性条件下后者中间体的分子内
碘环化。该策略的灵活性使得能够高效合成各种取代的2 H-
吡喃-2-酮。