Reinvestigation of a modified Hantzsch thiazole synthesis
作者:Enrique Aguilar、A.I. Meyers
DOI:10.1016/s0040-4039(00)77147-4
日期:1994.4
A recently reported modified Hantzsch reaction was reinvestigated and conditions were found to reach enantiomerically pure thiazole amino acid derivatives.
对最近报道的改良的Hantzsch反应进行了重新研究,发现条件达到了对映体纯的噻唑氨基酸衍生物。
Synthesis and Antimicrobial Activity
<i>in Vitro</i>
of New Amino Acids and Peptides Containing Thiazole and Oxazole Moieties
2-(Pyrrolidinyl)thiazole-4-carboxylic acid 5d, 2-(1-aminoalkyl)thiazole-4-carboxamides and hydrazides 8, 10 have been synthesized using alanine, valine, and proline as educts. In addition oxazole amino acids derived from leucine 20a and alanine 20b and some peptides 13, 14, 16 containing the 5-ring heterocyclic backbone modifications have been prepared. The thiazole and oxazole containing amino acids and peptides showed moderate antibacterial activity in vitro against various Gram-positive (Staphylococcus aureus, Bacillus cereus, etc.) and Gram-negative (Escherichia coli, Proteus vulgar is, etc.) bacteria, fungi (Candida albicans), and yeast (Saccharomyces cerevisae, etc.).
Total synthesis of ulongamide A, a cyclic depsipeptide isolated from marine cyanobacteria Lyngbya sp.
作者:Cuauhtémoc Alvarado、Eduardo Díaz、Ángel Guzmán
DOI:10.1016/j.tetlet.2006.11.117
日期:2007.1
A total synthesis of ulongamide A (1), a cytotoxic natural cyclicdepsipeptide, was achieved by a convergent route involving coupling of the fragments 7 and 8 to the pentapeptide 24, and subsequent cyclization thereof after prior removal of the t-Boc protecting groups.