[2+2] Cycloaddition of ketenes with ynamides. A general method for the synthesis of 3-aminocyclobutenone derivatives
作者:Amanda L. Kohnen、Xiao Yin Mak、Tin Yiu Lam、Joshua R. Dunetz、Rick L. Danheiser
DOI:10.1016/j.tet.2005.11.088
日期:2006.4
Ynamides react with ketenes in [2+2] cycloadditions leading to a variety of substituted 3-aminocyclobut-2-en-1-ones. The ynamides employed in these reactions are readily available via the copper-promoted N-alkynylation of carbamates and sulfonamides with alkynyl bromides and iodides. The scope of the [2+2] cycloaddition with regard to both the ketene and ynamide component is described.
Ynamides 与烯酮以 [2+2] 环加成反应生成各种取代的 3-aminocyclobut-2-en-1-ones。这些反应中使用的炔酰胺很容易通过铜促进的氨基甲酸酯和磺酰胺与炔基溴和碘化物的 N-炔基化反应获得。描述了 [2+2] 环加成与烯酮和炔酰胺组分的范围。