The reaction of lithium salts of dialkyl methylphosphonates with suitably protected amino acid methyl esters at low temperature, followed by removal of protecting groups in the presence of trimethylsilyl bromide provides an efficient method for the synthesis of the titled compounds.
二烷基
甲基膦酸酯的
锂盐与适当保护的
氨基酸甲基酯在低温下反应,然后在三甲基甲
硅烷基
溴的存在下除去保护基团,为合成标题化合物提供了一种有效的方法。