The convenient syntheses of a few methyl 2-(1-amino)alkenyl thiazoline-4-carboxylates and methyl 2-[2-(1-amino)ethenyl-bithiazolyl] thiazoline-4-carboxylate have been accomplished. The latter is an important partial skeleton of macrobicyclic peptide antibiotic cyclothiazomycin.
The first palladium-catalyzed borylation of 4-bromo-2-ketothiazoles followed by a Suzuki cross-coupling reaction with haloheteroaromatics using Buchwaid's Cy-JohnPhos and XPhos ligands is reported. The methodology has allowed the fast preparation of highly valuable 4-pyridinyl- and 4-thiazolyl-2-ketothiazoles as common subunits of thiopeptide antibiotics. As direct applications, novel concise syntheses of a sulfomycinamate thio-analogue as well as micrococcinate and saramycetate esters are described.
Synthesis and evaluation of a novel bleomycin A2 analogue: continuing assessment of the linker domain
作者:Dale L Boger、Brian M Aquila、Winston C Tse、Mark Searcey
DOI:10.1016/s0040-4039(00)01633-6
日期:2000.12
The synthesis and evaluation of a bithiazole ester analogue of deglycobleomycin A(2) that addresses the importance of the bithiazole-L-threonine amide for efficient DNA cleavage is described. (C) 2000 Elsevier Science Ltd. Ail rights reserved.
Total syntheses of amythiamicins A, B and C
作者:K. C. Nicolaou、Dattatraya H. Dethe、David Y.-K. Chen
DOI:10.1039/b805069b
日期:——
Totalsyntheses of the thiopeptide antibiotics amythiamicins A, B and C are reported.