Alkylidene Meldrum's Acids as Platforms for the Vinylogous Synthesis of Dihydropyranones
作者:Stéphane Wittmann、Thomas Martzel、Cong Thanh Pham Truong、Martial Toffano、Sylvain Oudeyer、Régis Guillot、Chloée Bournaud、Vincent Gandon、Jean‐François Brière、Giang Vo‐Thanh
DOI:10.1002/anie.202014489
日期:2021.5.10
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。