Palladium-Catalyzed Cascade 5-<i>endo</i>-dig Cyclization of Ynamides to Form 4-Alkynyloxazolones
作者:Tales A. C. Goulart、Davi Fernando Back、Sidnei Moura E. Silva、Gilson Zeni
DOI:10.1021/acs.joc.1c02978
日期:2022.3.4
The selective synthesis of 4-alkynyloxazolones and their further applications as substrates to electrophile-promoted nucleophilic cyclization have been developed. The reaction of ynamides with terminal alkynes proceeded smoothly to give 4-alkynyloxazolones in the presence of a catalytic amount of palladium(II) acetate. The products were obtained with the sequential formation of new C–C and C–O bonds
已经开发了 4-炔基恶唑酮的选择性合成及其作为底物在亲电促进的亲核环化中的进一步应用。在催化量的乙酸钯 (II) 存在下,炔酰胺与末端炔烃的反应顺利进行,得到 4-炔基恶唑酮。通过级联程序顺序形成新的 C-C 和 C-O 键获得产物。第一步涉及通过 5- endo -dig 闭合形成碳-氧键,结晶样品的 X 射线分析证实了这一点。随后,4-炔基恶唑酮与亲电硒源的反应通过亲电促进的亲核环化得到 3-苯基硒基苯并呋喃衍生物。