Total synthesis of myxothiazols, novel bis-thiazole β-methoxyacrylate-based anti-fungal compounds from myxobacteria
作者:John M. Clough、Henry Dube、Bruce J. Martin、Gerald Pattenden、K. Srinivasa Reddy、Ian R. Waldron
DOI:10.1039/b603433k
日期:——
Convergent total syntheses of myxothiazols A and Z are described. The syntheses are based on elaboration of the (S)-E,E-diene thioamide 22, conversion of 22 into the bis-thiazole 27 and Wittig reactions between 27c and the aldehyde 30. The substituted beta-methoxyacrylate aldehyde 30 was produced via an Evans asymmetric aldol protocol or via the 2H-pyran-2-one 31. An E-selective Wittig reaction between
描述了噻噻唑A和Z的收敛的总合成。合成是基于(S)-E,E-二烯硫酰胺22的制备,22转化为双噻唑27和27c与醛30之间的Wittig反应。取代的β-甲氧基丙烯酸醛30通过Evans不对称羟醛方案或通过2H-pyran-2-one31。衍生自phospho盐27c的叶立德与(+)-醛30之间的E-选择性Wittig反应导致(+)-噻唑Z(1b) ,与(+/-)-丙烯酰胺醛44的相应反应,得到(+/-)-甲噻唑A(1a)。补充研究导致了酯47b的合成,该酯对应于甲氧噻唑R和甲氧噻唑S。