substituted cis-β-lactams can be achieved by the annelation of Schiff bases from optically active ketal aldehydes derived from D-threonine. Similar annelation of Schiff bases from the triphenylsilyl ether of D-threonine ester and cinnamaldehyde leads to cis-β-lactams with high diastereofacial selectivity.
通过从衍生自
D-苏氨酸的旋光性
缩醛中席夫碱的脱核反应,可以实现各种取代的顺式β-内酰胺的对映体特异性合成。从
D-苏氨酸酯和
肉桂醛的三苯基甲
硅烷基醚对席夫碱进行类似的脱核反应,可制得具有高非对映选择性的顺式β-内酰胺。