2-Diethoxyphosphoryl-4-nitroalkanoates - Versatile Intermediates in the Synthesis of α-Alkylidene-γ-lactones and Lactams
作者:Tomasz Janecki、Edyta Błaszczyk、Henryk Krawczyk
DOI:10.1055/s-2004-835656
日期:——
Michael addition of various nitroalkanes 7a-f to ethyl (2-diethoxyphosphoryl)acrylate (6) gave 2-diethoxyphosphoryl-4-nitroalkanoates 8a-f. Transformation of the nitro functionality into hydroxy or amino group and cyclization yielded 3-(diethoxyphosphoryl)tetrahydro-2-furanones 11a-e or 3-(diethoxyphosphoryl)pyrrolidin-2-ones 14a-e, respectively. These compounds were then used in Horner-Wadsworth-Emmons olefinations of aldehydes to give 3-alkylidenedihydrofuran-2-ones 12a-e or 17a-c and 3-methylidenepyrrolidin-2-ones 15a-e.