spectroscopic evidence and an ambiguous x-ray analysis was disproved by synthesis. An alternative formulation 1, including its absolute configuration, was confirmed by a stereospecific synthesis that began with condensation of the acetonide 8 of (R)-glyceraldehyde with the dianion from(Z)-N-methyl-2-benzyloxy-3-phenylthioacrylamide (34). The derived α-hydroxy lactone 43 was converted to the enamide moiety
根据光谱证据错误推导了海洋真菌代谢产物瘦球菌素的结构3,并通过合成证明了模糊的X射线分析。立体定向合成证实了另一种制剂1的绝对构型,包括其绝对构型,该立体特异性合成始于(R)-
甘油醛的
丙酮化物8与(Z)-N-甲基-2-苄氧基-3-苯基
硫代
丙烯酰胺的二价阴离子的缩合反应(34)。衍生的α-羟基内酯43通过
叠氮基内酯45的分解而被转化为瘦球蛋白的酰胺部分。。因此,脂球蛋白是(4S,5R)-2-乙酰
氨基-4,5,6-三羟基-
2-己烯酸的γ-内酯,因此是D
氨基己糖的衍
生物。