(+)-Trienomycins A, B, C, and F and (+)-Mycotrienins I and II: Relative and Absolute Stereochemistry
作者:Amos B. Smith、John L. Wood、Weichyun Wong、Alexandra E. Gould、Carmelo J. Rizzo、Joseph Barbosa、Kanki Komiyama、Satoshi Ōmura
DOI:10.1021/ja961400i
日期:1996.1.1
The complete relative and absolute stereochemistries have been elucidated for the ansamycin antibiotics (+)-trienomycins A, B, and C and their potent antifungal congeners, the (+)-mycotrienins I and II. A new species, (+)-trienomycin F, has also been isolated and characterized. In addition, an end-game synthetic strategy for the trienomycins and mycotrienins has been developed.
安沙霉素抗生素 (+)-三烯霉素 A、B 和 C 及其有效的抗真菌同源物 (+)-霉菌三烯素 I 和 II 的完整相对和绝对立体化学已经阐明。一个新物种,(+)-trienomycin F,也已被分离和表征。此外,还开发了三烯霉素和霉菌三烯素的最终合成策略。
Stereochemical effects in mass spectrometry. 7. Determination of absolute configuration of some organic molecules by reaction mass spectrometry
AbstractIt was found that in the chemical ionization (isobutane) mass spectra of some asymmetric secondary alcohols and α‐amino acids, when a pair of enantiomers (such as R‐ and S‐2‐phenyIbutyric anhydride, R‐ and S‐mandelic acid, R‐ and S‐2‐methylbutanoic acid or R‐ and S‐α‐phenyl ethyl amine) were used as reaction reagents, the relative abundances of characteristic ions formed by the stereoselective reaction between sample and reagent of the same configuration were much higher than those ions formed by the sample and a reagent of a different configuration. The absolute configuration of the sample molecule may be predicted by examination of mass spectra of the sample measured with R‐ and S‐reagent respectively. This approach proved to be a convenient way for determination of the absolute configurations of organic molecules on a micromole level by mass Spectrometry.
SMITH, AMOS (III);WOOD, JOHN L.;WONG, WEICHYUN;GOULD, ALEXANDRA E.;RIZZO,+, J. AMER. CHEM. SOC., 112,(1990) N0, C. 7425-7426
作者:SMITH, AMOS (III)、WOOD, JOHN L.、WONG, WEICHYUN、GOULD, ALEXANDRA E.、RIZZO,+