condensation reaction. The tetrapropoxycalix[4]arene pseudopeptide 33 shows conformational and self-assembly properties quite different to those of the dipropoxy derivatives 12–21. The observed differences are explained on the basis of the different conformational flexibilities of the twocalix[4]arene scaffolds. Calixarene 5 is more rigid than 27 thanks to the presence of two OH groups at the lower (narrow) rim
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.
Smith et al., Journal of Biological Chemistry, 1952, vol. 199, p. 801,808
作者:Smith et al.
DOI:——
日期:——
Synthesis and <sup>13</sup>C NMR Equilibria Studies of (1-<sup>13</sup>C)Leupeptin and Analogs
作者:Rose Marie McConnell、Crissy Patterson-Goss、Walter Godwin、Brant Stanley
DOI:10.1021/jo980070c
日期:1998.8.1
Chemical Studies on the Mistletoe. II. The Structure of Viscumamide, a New Cyclic Peptide Isolated from<i>Viscum album</i>Linn.<i>var.</i>coloratum Ohwi
作者:Yasuaki Okumura、Atsushi Sakurai
DOI:10.1246/bcsj.46.2190
日期:1973.7
A newcyclic peptide, viscumamide (C30H55N5O5) was isolated from Viscum album Linn. var. coloratum Ohwi, and the structure Ia (Remark: Graphics omitted.) was assigned to this substance from gas-chromatographic studies on the products of partial hydrolysis.
从 Viscum album Linn 中分离出一种新的环肽,viscumamide (C30H55N5O5)。变种 coloratum Ohwi,根据对部分水解产物的气相色谱研究,该物质的结构为 Ia(备注:省略图形。)。