Organocatalyzed carboxylative cyclization of propargylic amides with atmospheric CO<sub>2</sub> towards oxazolidine-2,4-diones
作者:Hui Zhou、Sen Mu、Bai-Hao Ren、Rui Zhang、Xiao-Bing Lu
DOI:10.1039/c8gc03929a
日期:——
The metal-free carboxylative cyclization of propargylic amides with CO2 to oxazolidine-2,4-diones was achieved for the first time employing 1,5,7-triaza-bicyclo-[4.4.0]dec-5-ene (TBD) as an organocatalyst. This method allows for the efficient and selective synthesis of a variety of (Z) 5-alkylidene 1,3-oxazolidine-2,4-diones, and a variety of functional groups are well-tolerated under mild reaction
首次使用1,5,7-三氮杂双环-[4.4.0] dec-5-ene(TBD)实现了用CO 2将炔丙基酰胺与CO 2的无金属羧基环化为恶唑烷-2,4-二酮。作为有机催化剂。该方法允许有效和选择性地合成各种(Z)5-亚烷基1,3-恶唑烷-2,4-二酮,并且在温和的反应条件下,各种官能团均具有良好的耐受性。理论研究表明,TBD的双功能活性(碱/氢键供体)在加速该反应中起关键作用。