作者:Luke A. Adams、Jonathan P. H. Charmant、Russell J. Cox、Magnus Walter、William G. Whittingham
DOI:10.1039/b311322a
日期:——
The in situ reaction of protected dehydroamino acids with derivatives of vinyldiazomethane leads to good to excellent yields of vinyl cyclopropanes via 3 + 2 dipolar cycloaddition followed by N(2) extrusion. Chromatographic separation of the cyclopropane diastereomeric products, followed by characterisation by (1)H NMR and X-ray crystallography allowed the cis and trans diastereomers to be easily identified
受保护的脱氢氨基酸与乙烯基重氮甲烷衍生物的原位反应通过3 + 2偶极环加成,然后进行N(2)挤出,导致乙烯基环丙烷的收率良好。色谱分离环丙烷非对映异构体产物,然后通过(1)NMR和X射线晶体学进行表征,可以轻松鉴定出顺式和反式非对映体。乙烯基部分的氧化裂解随后可从市售材料中分三步直接得到受保护的环丙烷天冬氨酸衍生物。这些化合物被转化为β-天冬氨酰磷酸的保护的亚甲基膦酸酯,二氟亚甲基膦酸酯和氨基磷酸酯类似物。