Efficient total synthesis of the natural products 2,3,4,6-tetra-O-galloyl-d-glucopyranose, 1,2,3,4,6-penta-O-galloyl-β-d-glucopyranose and the unnatural 1,2,3,4,6-penta-O-galloyl-α-d-glucopyranose
✍ Scribed by Karamali Khanbabaee; Kerstin Lötzerich
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 436 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0040-4020
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📜 SIMILAR VOLUMES
## Abstract The synthesis of 1,2,3,4,6‐penta‐__O__‐galloyl‐[U‐^14^C]‐D‐glucopyranose is described. [U‐^14^C] glucopyranose was reacted with tri‐O‐benzylgallic acid forming 1,2,3,4,6‐penta(tri‐O‐benzylgalloyl)‐[U‐^14^C]‐D‐glucopyranose as chromatograpically separable anomers. Removal of the benzyl g
## Crystals of the tetrasaccharide, (2,3,4,6-tetra-0acetyl-fi-D-ghxopyranosyl~-(1 + 3)-[2,3,4,6-tetra-O-acetyI+LD-gIucopyranosyI-(1 --t 6)]-(2,4-di-0-acetyl-g\_D-glucopyranosyl)-1 --) 3)-1,2,4,6-tetrad-acetyl$?-n-ghicopyranose, belong to tge monoclinic system, space group P2,, with a = 12.709(4),
## Abstract Die Polykondensation der 2,3,6‐Tri‐__O__‐benzyl‐D‐glucose **(1)** und der 2,3,4‐Tri‐__O__‐benzyl‐D‐glucose **(3)** läßt sich unter Protonenkatalyse nicht durchführen, weil beide Verbindungen in ihre inneren Anhydride [1, 4‐Anhydro‐2,3,6‐tri‐__O__‐benzyl‐α‐D‐glucose **(2)** bzw. 1,6‐Anhy
## Abstract 1,4‐Anhydro‐2,3,6‐tri‐__O__‐benzyl‐α‐D‐glucopyranose **(1)** wird mit Triäthyloxonium‐tetra‐fluoroborat **(2)** zu einem linearen 2,3,6‐Tri‐__O__‐benzyl‐β(1 → 4)‐polysaccharid polymerisiert. Dies enthält einen geringen Teil α(1 → 4)‐Bindungen. Abspaltung der Benzylreste führt zum freien