Practical Asymmetric Conjugate Alkynylation of Meldrum’s Acid-Derived Acceptors: Access to Chiral β-Alkynyl Acids
作者:Sheng Cui、Shawn D. Walker、Jacqueline C. S. Woo、Christopher J. Borths、Herschel Mukherjee、Maosheng J. Chen、Margaret M. Faul
DOI:10.1021/ja909105s
日期:2010.1.20
The enantioselective conjugate addition of alkynyl nucleophiles has been a long-standing challenge in synthetic chemistry. This paper describes a highly practical asymmetricconjugatealkynylation of Meldrum's acid-derived acceptors using cinchonidine (<$100/kg) as the chiral mediator. The process provides practical access to chiral beta-alkynyl acids. Noteworthy attributes of the method are its broad
2,2-dimethyl-5-(5-r-furfurylidene)-1,3-dioxane4,6 diones 7. Synthesis, structure, and properties of 2,2dimethyl-5-(3-furfuryldiene and 3-thienylidene)-1,3dioxane-4,6-diones
作者:G. D. Krapivin、N. I. Val'ter、V. E. Zavodnik、D. Vegkh、L. Fishera、V. G. Kul'nevich