Kalapattukuppuswamy Kuppuswamy B. Balasubramanian

sugar

article

chemical structure

nuclear magnetic resonance

priority journal

synthesis

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IIT Madras

Vilsmeier-haack reactoin of glycals-a short route to C-2-formyl glycals☆

Tetrahedron Letters

Fulltext

Molecules

Unsaturated sugars: Syntheses and applications. A special issue in honour of Professor Kalpattu Kuppuswamy Balsubramanian

Ozonolysis of 2-acetoxymethyl-1,5-anhydro-3,4,6-tri-O-benzyl-2-deoxy-D- arabino-hex-1-enitol gave 1-O-acetyl-3,4,6-tri-O-benzyl-4-O-formyl-D-arabino- hex-2-ulose (5). Subsequent hydrolysis and acetylation of 5 provided 1,2-di-O-acetyl-3,4,6-tri-O-benzyl-D-fructofuranose 6 in excellent yield. This methodology allows specific deuteration at C-1 of a protected D-fructofuranose derivative. This approach therefore could serve as [6+1-1] formulation for hexose series inter-conversion, that is, aldohexopyranose to ketohexofuranose. © 2005 Elsevier Ltd. All rights reserved.

Carbohydrate Research

Stereoselective synthesis of a ketohexofuranose from an aldohexopyranose by a [6+1-1] strategy

A simple and convenient method for the synthesis of aryl-3,4,6-tri-O-benzyl-2-deoxy-2-methylene-hexopyranosides 5,6 and 7, glycosides which are not accessible by the conventional Ferrier rearrangement, has been described based on the Mitsunobu reaction of alcohols 3 and 4 with substituted phenols. The anomeric configurations of glycosides 5 and 6 were established by detailed NOE studies. The reaction is also successfully extended to the synthesis of phthaloyl derivative 10. A mild, neutral and non-acidic alternative to Ferrier rearrangement for the synthesis of 2,3-dideoxy-hex-2-enopyranosides has also been demonstrated with a variety of nucleophiles. © 1994.

Tetrahedron

Mitsunobu reaction of 1,5-anhydro-3,4,6-tri-O-benzyl-2-deoxy-2-hydroxymethyl-hex-1-enitols and 1,5-anhydro-2-deoxy-4,6-O-protected-hex-1-enitols. A novel method for the synthesis of 2-C-methylene glycosides and an useful alternative to Ferrier rearrangement

Syntheis of tri-O-benzyl-2-C-acetoxymethylglycals and subsequent Ferrier rearrangement to give 2-C-methylene glycosides is described.

Journal of the Chemical Society, Chemical Communications

A new ferrier system: 2-C-acetoxymethylglycals. A covenient entry to 2-C-methylene glycosides

Pyrano[3,2-c]pyranone is an important structural motif present in many natural products exhibiting diverse biological activities. Two series of carbohydrate fused pyrano[3,2-c]pyranone derivatives (n = 20) were efficiently synthesized starting from 2-C-formyl galactal and 2-C-formyl glucal, reacting with various 4-hydroxycoumarins in a very short reaction time (10 min) under microwave assisted conditions. The anticancer activity of these synthesized pyrano[3,2-c]pyranones was determined in detail through cellular assays against MCF-7 (breast), MDA-MB-231 (breast) and HepG2 (liver) cancer cell lines. The newly synthesized pyrano[3,2-c]pyranones were screened for their cell-viability and anti-proliferative activity against MCF-7, MDA-MB-231 and HepG2 cell lines. Compounds 12, 13 and 14 exhibited high growth inhibitory potencies selectively against MCF-7 cells with half-maximal inhibitory concentration (IC50) values of 19.9, 14.5 and 10.9 μM respectively. Compounds 12, 13, 14, 15 and 19 inhibited the growth of MDA-MB-231 cells (breast) by 43, 44, 37, 31 and 45\% respectively. However, no inhibitory effect was observed for these compounds in the human liver cancer cell line (HepG2) and normal cell lines (HEK293, human embryonic kidney cells). Mechanistic studies showed that these compounds alter the cell morphology and cause G2/M arrest in MCF-7. Further studies showed that compounds 12, 13 and 14 significantly inhibited cell migration which was accompanied by altered microtubule distribution. An enhanced accumulation of these compounds in cells was observed as compared to the 4-hydroxycoumarins precursor in the intracellular uptake assay. These findings confirm that carbohydrate fused pyrano[3,2-c]pyranones are better candidates for anticancer activity. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

New Journal of Chemistry

Stereoselective synthesis of carbohydrate fused pyrano[3,2-c]pyranones as anticancer agents

Vilsmeier-haack reactoin of glycals-a short route to C-2-formyl glycals

Journal	Tetrahedron Letters
ISSN	00404039
Open Access	No