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.
Anchimerically assisted lewis acid cleavage of tetrahydrofurans to furnish 1,4-Diols
作者:Laurence M. Harwood、Brian Jackson、Keith Prout、Fiona J. Witt
DOI:10.1016/s0040-4039(00)98811-7
日期:1990.1
trahydrofurans with TiCl4 results in cleavage of the heterocyclic ring with intervention by the appropriately situated ester group to form intermediates which, on work-up and hydrolysis, furnish 1,4-diols.
作者:HARWOOD, LAURENCE M.、JACKSON, BRIAN、PROUT, KEITH、WITT, FIONA J.
DOI:——
日期:——
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.