Synthesis of the C1-C13 Fragment of Kendomycin: Atropisomerism around a C−Aryl Glycosidic Bond
摘要:
The left-hand fragment 2 of the novel antibiotic kendomycin (1) has been synthesized by an aldol addition and a Michael-type 1,4-addition of a C5 alcohol with a C9-C11 enone. Compound 2 shows an interesting atropisomerism around the C4a-C5-sp2 -sp3 bond. The atropisomers can be separated in pure forms by low-temperature high-pressure liquid chromatography.
Stereocontrolled Synthesis of<i>C</i>-Arylglycosides Applied to the South West Fragment of the Antibiotic Kendomycin
作者:Johann Mulzer、Maria M. Marques、Stefan Pichlmair、Harry J. Martin
DOI:10.1055/s-2002-35990
日期:——
A nine step synthesis of the southwest fragment 3 of the antibiotic kendomycin (1) is reported. The tetrahydropyran ring is prepared in a highly stereocontrolled and efficient sequence. The key step concerns an anti-aldol reaction using chiral ketone 10. C-Aryl glycoside 3 exhibits atropisomerism and the relative configuration around its tetrahydropyran ring was established by NOE experiments.
The left-hand fragment 2 of the novel antibiotic kendomycin (1) has been synthesized by an aldol addition and a Michael-type 1,4-addition of a C5 alcohol with a C9-C11 enone. Compound 2 shows an interesting atropisomerism around the C4a-C5-sp2 -sp3 bond. The atropisomers can be separated in pure forms by low-temperature high-pressure liquid chromatography.