Conversion of diacetyl-C-(β-d-glucopyranosyl)phloroglucinol to spiroketal compounds
摘要:
Diacetyl-C-(beta-D-glucopyranosyl)phloroglucinol was converted by refluxing in water to spiro(benzofuran-[2H]furan) a new compound, along with spiro(benzofuran-[2H]pyran). The stereochemistry of the quaternary carbon of both spiro compounds had an S-configuration. (C) 2003 Elsevier Ltd. All rights reserved.
SYNTHESIS OF 2,4-DIACETYL-6-C-β-D-GLUCOPYRANOSYLPHLOROGLUCINOL
作者:Heitaro Obara、Masahiko Hattori、Yuzo Matsui
DOI:10.1246/cl.1984.1039
日期:1984.6.5
2,4-Diacetyl-6-C-β-d-glucopyranosylphloroglucinol was directly obtained by the glucosylation of 2,4-diacetylphloroglucinol with 2,3,4,6-tetra-O-acetyl-α-d-glucopyranosyl bromide in the presence of sodium in methanol.
and ‐allopyranosides in water for 1 d gave two kinds of spiroketal derivatives in total yields of 77%, 74%, and 64%, respectively. The structure and stereochemistry of the six new spiro(benzofuran‐[2H]pyran and ‐[2H]furan) derived from galactoside and alloside were verified by NMR analysis. The production ratios of the spiro derivatives were measured by HPLC analysis at regular time intervals. Since the
Diacetyl-C-(beta-D-glucopyranosyl)phloroglucinol was converted by refluxing in water to spiro(benzofuran-[2H]furan) a new compound, along with spiro(benzofuran-[2H]pyran). The stereochemistry of the quaternary carbon of both spiro compounds had an S-configuration. (C) 2003 Elsevier Ltd. All rights reserved.