Synthesis of .alpha.-hydroxy ketones by samarium(II) iodide-mediated coupling of organic halides, an isocyanide, and carbonyl compounds
作者:Masahiro Murakami、Teiji Kawano、Hajime Ito、Yoshihiko Ito
DOI:10.1021/jo00058a028
日期:1993.3
A new strategy for the synthesis of a-hydroxy ketones by samarium(II) iodide-mediated three-component coupling of organic halides, an isocyanide, and carbonyl compounds is disclosed. An (alpha-iminoalkyl)samarium(III) species is generated in situ by treatment of an organic halide with 2 equiv of samarium(II) iodide in the presence of 2,6-xylyl isocyanide. Subsequent treatment of the mixture with a carbonyl compound affords alpha-hydroxy imines, which are converted by acid-catalyzed hydrolysis to the corresponding alpha-hydroxy ketones. The mild reaction conditions employed are compatible with a variety of functionalities including terminal acetylenes and trimethylsilyl ethers. Application of the method to the synthesis of alpha-hydroxy aldehydes is also presented.