Functionalized oxazoles and bis-oxazoles are obtained by side-chain oxidation of beta-hydroxy amides with the Dess-Martin periodinane, followed by cyclodehydration with triphenylphosphine/iodine in the presence of triethylamine.
An improved protocol for azole synthesis with PEG-supported Burgess reagent
作者:Peter Wipf、Srikanth Venkatraman
DOI:10.1016/0040-4039(96)00918-5
日期:1996.7
polyethyleneglycol-linked version of Burgessreagent was developed and applied toward the cyclodehydration of β-hydroxy amides and thioamides. The desired oxazolines and thiazolines were obtained in high yields and excellent purities. The major advantages of the polymer bound reagent are its improved ease of handling and greatly increased yields in the synthesis of labile oxazolines.
An investigation of the mitsunobu reaction in the preparation of peptide oxazolines, thiazolines, and aziridines
作者:Peter Wipf、Chris P. Miller
DOI:10.1016/s0040-4039(00)60949-8
日期:1992.10
e mediated cyclization of serine and allo-threonine derivatives provides peptide oxazolines, whereas cyclization of threonine containing substrates leads to N-acyl aziridines. In the thiopeptide series, only thiazolines are obtained. The presence of a moderately strong base is necessary for the formation of aziridines from threonine peptides.
Total Synthesis of Cyanobactin Natural Product Balgacyclamide B
作者:Arnaldo X. Torres‐Hernandez、Prathibha Desman、Thi Nguyen、Vinh Hoang、Yichao Zhang、Ashley Bartels、Ryan J. Rafferty
DOI:10.1002/chem.202303316
日期:2024.1.11
A synthetic pathway for balgacyclamide B was developed in 17-steps and a 2 % overall yield. The synthetic pathway opens a new route towards recently isolated cyanobactin's, especially for the balgacyclamide family and its analogs. Advanced intermediates from the synthetic pathway are being used to explore porin-mediated transportation in gram-negative bacteria.
balgacyclamide B 的合成途径经过 17 个步骤开发,总产率为 2%。该合成途径为最近分离的蓝菌素开辟了一条新途径,特别是对于 balgacyclamide 家族及其类似物。合成途径的高级中间体被用于探索革兰氏阴性细菌中孔蛋白介导的运输。
Stereospecific synthesis of peptide analogs with allo-threonine and D-allo-threonine residues