Tetrahedron p. 10685 - 10694 (1999)
Update date:2022-08-05
Topics:
Akaji, Kenichi
Kiso, Yoshiaki
A method for total synthesis of thiangazole (1), a tris-thiazoline- oxazole metabolite, is described. The key intermediate 9, a linear tetrapeptide amide composed of three S-benzyl-2-methylcysteine residues and a O-benzyl-threonine amide, was synthesized in 4 steps using 2-chloro-1,3- dimethyl-imidazolidium hexafluorophosphate(CIP)mediated activation. The successive thiazoline/oxazole rings were constructed by TiCl4mediated cycledehydration followed by acid-catalyzed Robinson-Gabriel reaction without difficulty.
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