• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1990 Fiscal Year Final Research Report Summary

Synthesis of the Hexasaccharides Containing Nitrogen Atoms Starting from Lactose

Research Project

Project/Area Number 01571159
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Chemical pharmacy
Research InstitutionNagoya City University

Principal Investigator

CHIBA Taku  Nagoya City University Instructor Faculty of Pharmaceutical Sciences, 薬学部, 講師 (10094385)

Project Period (FY) 1989 – 1990
KeywordsSynthesis / Oligosaccharides in the human milk / Lacto-N-hexaose / Para-lacto-N-neohexaose / Oxazoline method / N-Acetyllactosamine / Lacto-N-biose I / Trimethylsilyl triflate
Research Abstract

It is of common knowledge to be more than sixty oligosaccharides in the human milk. In the latter half of 1960, Hakomori, et al. Reported that there were some ceramides of the human milk oligosaccharides (ex. lacto-N-neotetraose and difucosylーparaーlactoーNーneohexaose, etc.) in the glycolipids of the cell surface of some cancers. As a representative of investigation has studied the chemical modification and inversion of lactose, and syntheses of the human milk oligosaccharides and their analogues since 1971, now he has aimed to synthesize the hexasaccharides containing nitrogen atoms, lacto-N-hexaose (1) which was contained in small amount in the human milk and paraーlacto-Nneohexaose (2) which was a core hexasaccharide in the glycolipids of the cell surface of some cancers. About the synthesis of (1), starting from benzy1 betalactoside (3), selective allylation of C-3' position, benzylidenation, benzylation, followed by selective cleavage of benzylidene acetal gave a main product (4) with the free C-6' position. Coupling (4) with the oxazoline derivative of N-acetyllactosamine gave the tetrasaccharide derivatine (5) in 73.1% yield. After deallylation of (5), coupling with the oxazoline derivative of lactoN-biose I gave the hexaseaccharide derivative (6) in 36.2% yield. Deprotection of (6) gave (1) in 78.9% yield. About the synthesis of (2), starting from (3), a lactose derivative (7) with the free C-3' and 4' positions was obtained by chemical modification. A lactosamine derivative (8) with N-phthaloyl and allyl groups in C-2 and 3' positions, respectively, and that (9) with Nーphthaloyl group were prepared via lactal derivative by chemical modification. Coupling (7) with (8) in the presence of trimethylsilyl triflate as promoter gave the tetrasaccharide derivative (10) in 49% yield. After deallylation of (10), coupling with (9) gave the hexasaccharide derivative (11) in 21% yield. Hereafter, deprotection of (11) will give (2).

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] Chiba taku(千葉 拓): "Chemical Modification of Lactose.XIX.Synthesis of LactroーNーhexaose." Chemical and Pharmaceutical Bulletin.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chiba taku(千葉 拓): "Chemical Modification of Lactose.XX.Synthesis of ParaーlactoーNーneohexaose." Chemical and Pharmaceutical Bulletin.

    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 1993-08-12  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi