作者:Atsushi Sakurai、Yasuaki Okumura
DOI:10.1246/bcsj.52.540
日期:1979.2
Viscumamide, cyclo(–l-Leu–l-Ile–l-Leu–l-Ile–l-Leu–) (1a) and its three analogs, cyclo (–l-Leu–l-Leu–l-Leu–l-Leu–l-Leu–), cyclo (–l-Leu-l-Ile-l-Leu–l-Leu–l-Leu–), and cyclo (–l-Ile–l-Ile–l-549.tex Leu–l-Leu–l-Leu–) were synthesized by the N-hydroxysuccinimide ester method. The yields in the cyclization step were low due to a strong intermolecular association even at high dilution, which causes cyclodimerization and other polymerization. Chromatographic and spectroscopic comparison of synthetic 1a with natural viscumamide showed their identity. The structure of viscumamide was confirmed to be 1a.
采用 N-羟基琥珀酰亚胺酯法合成了粘胶酰胺环(-l-Leu-l-Ile-l-Leu-l-Ile-Leu-Leu-Leu-Leu-)(1a)及其三种类似物环(-l-Leu-l-Leu-Leu-Leu-Leu-)、环(-l-Leu-l-Ile-l-Leu-Leu-Leu-)和环(-l-Ile-l-Ile-l-549.tex Leu-leu-Leu-Leu-)。环化步骤的产率较低,这是因为即使在高稀释度下,分子间的关联性也很强,从而导致环二聚化和其他聚合反应。合成 1a 与天然粘胶酰胺的色谱和光谱对比显示了它们的同一性。粘胶酰胺的结构被确认为 1a。