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.
将各种硝基
烷烃 7a-f 与(2-二乙氧基
磷酰)
丙烯酸乙酯 (6) 迈克尔加成,可得到 2-二乙氧基
磷酰-4-硝基烷酸酯 8a-f。将硝基官能团转化为羟基或
氨基并环化后,分别得到 3-(二乙氧基
磷酰)四氢-2-
呋喃酮 11a-e 或 3-(二乙氧基
磷酰)
吡咯烷-2-酮 14a-e。然后将这些化合物用于霍纳-沃兹沃斯-艾蒙斯醛的烯化反应,得到 3-亚烷基二氢
呋喃-2-酮 12a-e 或 17a-c,以及 3-亚甲基
吡咯烷-2-酮 15a-e。