Total synthesis of (+)-isoaureothin: determination of the absolute configurations of aureothin, isoaureothin and spectinabilin
摘要:
The absolute configurations of isoaureothin and related metabolites having a nitro group have been unambiguously determined by means of asymmetric synthesis of (+)-isoaureothin through (+)-isoaureonone.
Aureothin, isoaureothin, and related compounds have been synthesized in short steps starting from 3,5-dimethyl-6-formyl-4-methoxy-2-pyrone. In addition, the geometry of the conjugated double bonds in isoaureothin and its isomers has been unambiguously determined on the basis of NOE experiments.
以 3,5-二甲基-6-甲酰基-4-甲氧基-2-吡喃酮为原料,通过短步骤合成了金黄素、异金黄素和相关化合物。此外,异硫脲素及其异构体中共轭双键的几何形状已在 NOE 实验的基础上明确确定。
Structural Revision of Griseulin, a Bioactive Pyrone Possessing a Nitrophenyl Unit
Biologically active griseulin isolated from Streptomyces sp. was synthesized, however the spectral data of the synthetic sample did not agree with the reported one. Synthesis of the related sample and detailed reexamination of the spectroscopic properties resulted in the structural revision of griseulin, which should be identical with luteoreticulin.