Determination of the Relative and Absolute Stereochemistry of Fostriecin (CI-920)
摘要:
The absolute stereochemistry of fostriecin (1, CI-920), a potent antitumor antibiotic presently in Phase I clinical trials at NCI, was determined to be 5R,8R,9R,11R. 2D H-1-H-1 NMR. NOE experiments conducted on the cyclic phosphate derivative 2 and acetonide revealed a syn-diol stereochemical relationship between C8 and C9 and an anti-diol stereochemical relationship between C9 and C11, respectively. The 5R absolute configuration assignment was confirmed by synthesis of the degradation product 8 previously disclosed. Additional degradation studies of 1 to provide 7 and chiral-phase HPLC comparison with a sample of known chirality established the absolute stereochemistry of C11 to be R. This, along with the relative stereochemical assignments established the full set of absolute stereochemistry assignments for 1.
Dinuclear Asymmetric Zn Aldol Additions: Formal Asymmetric Synthesis of Fostriecin
摘要:
Direct asymmetric aldol reactions constitute a powerful methodology for the efficient synthesis of complex natural products. Herein we report the first application of our recently reported dinuclear Zn-catalyzed direct aldol addition of alkynyl ketones to aldehydes in a short and efficient formal asymmetric synthesis of fostriecin, a potent cyctotoxic natural product. This work highlights not only the power of the aldol methodology but also the utility of the akynyl silane aldol adducts, as it is subsequently utilized in a vinyl silane cross-coupling reaction which affords the target molecule in 14 steps for the longest linear sequence in 8.5% overall yield.
FOSTRIECIN DERIVATIVES AND THE PHARMACEUTICAL USES THEREOF
申请人:Tang Li
公开号:US20120065171A1
公开(公告)日:2012-03-15
Novel Fostriecin (or FST) derivatives represented by formula (I), the pharmaceutical compositions and preparation methods thereof. The pharmaceutical uses of these compounds, especially the use for the preparation of pharmaceutical compositions for treating tumor, inhibiting cell over growth, or lowering myocardial infarction and the injury to cells.
Dinuclear Asymmetric Zn Aldol Additions: Formal Asymmetric Synthesis of Fostriecin
作者:Barry M. Trost、Mathias U. Frederiksen、Julien P. N. Papillon、Paul E. Harrington、Seunghoon Shin、Brock T. Shireman
DOI:10.1021/ja042435i
日期:2005.3.1
Direct asymmetric aldol reactions constitute a powerful methodology for the efficient synthesis of complex natural products. Herein we report the first application of our recently reported dinuclear Zn-catalyzed direct aldol addition of alkynyl ketones to aldehydes in a short and efficient formal asymmetric synthesis of fostriecin, a potent cyctotoxic natural product. This work highlights not only the power of the aldol methodology but also the utility of the akynyl silane aldol adducts, as it is subsequently utilized in a vinyl silane cross-coupling reaction which affords the target molecule in 14 steps for the longest linear sequence in 8.5% overall yield.
Determination of the Relative and Absolute Stereochemistry of Fostriecin (CI-920)
作者:Dale L. Boger、Masataka Hikota、Bryan M. Lewis
DOI:10.1021/jo962166h
日期:1997.3.1
The absolute stereochemistry of fostriecin (1, CI-920), a potent antitumor antibiotic presently in Phase I clinical trials at NCI, was determined to be 5R,8R,9R,11R. 2D H-1-H-1 NMR. NOE experiments conducted on the cyclic phosphate derivative 2 and acetonide revealed a syn-diol stereochemical relationship between C8 and C9 and an anti-diol stereochemical relationship between C9 and C11, respectively. The 5R absolute configuration assignment was confirmed by synthesis of the degradation product 8 previously disclosed. Additional degradation studies of 1 to provide 7 and chiral-phase HPLC comparison with a sample of known chirality established the absolute stereochemistry of C11 to be R. This, along with the relative stereochemical assignments established the full set of absolute stereochemistry assignments for 1.