Upon Brønsted base organocatalysis, ketone‐derived alkylidene Meldrum's acids proved to be competent vinylogous platforms able to undergo a formal (4+2) cycloaddition reaction with dihydro‐2,3‐furandione, providing an unprecedented route to 3,6‐dihydropyran‐2‐ones as spiro[4.5]decane derivatives with up to 98 % ee thanks to the commercially available Takemoto catalyst. Preliminary investigation showed
在Brønsted碱进行有机催化后,酮衍生的亚烷基Meldrum的酸被证明是能够与二氢2,3,3-
呋喃二酮进行正式(4 + 2)环加成反应的
乙烯基平台,为
3,6-二氢吡喃-2提供了前所未有的途径得益于商业上可买到的Takemoto催化剂,其为高达98%ee的
螺[4.5]癸烷衍
生物。初步研究表明,该反应可扩展至其他活化的酮,从而将这些亚烷基梅尔德鲁姆酸确立为
乙烯基系列中的新型C4合成子。