Asymmetric Synthesis of ?-Aminophosphonic Acids by Cycloaddition ofN-Glycosyl-C-dialkoxyphosphonoylnitrones
作者:Andrea Vaseila、Robert Voeffray
DOI:10.1002/hlca.19820650702
日期:1982.11.3
corresponding α-ammo-acid derivatives 23–26 of known configuration indicated preferential formation of the L-isomers. The cycloaddition products were transformed in good yield into the L-α-aminophosphonic acids 29, 30, 36, and 39.
二烷基磷酸酯的除了硝酮6,形成在原位从肟5和甲醛,得到羟胺7(86%)和8(88%),其与反应p苯醌在乙烯的存在下经由所述Ç -dialkoxyphosphonoylnitrones 9和10,得到环加成产物11 - 14具有约50%的非对映选择性一个(80-85%)。环加成产物转化为单异亚丙基衍生物15 – 18和双乙酸酯19 –22。NMR谱和所述化合物的比旋光的比较19 - 22与相应的α-氨基-酸衍生物的23 - 26已知构型的指示优先形成的L-异构体的。环加成产物以良好的收率成L-α-氨基膦酸转化29,30,36,和39。