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1990 Fiscal Year Final Research Report Summary

A Short Asymmetric Synthesis of Podophyllotoxin Related Antitumor Agent

Research Project

Project/Area Number 01571143
Research Category

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

Allocation TypeSingle-year Grants
Research Field Chemical pharmacy
Research InstitutionThe University of Tokyo

Principal Investigator

TOMIOKA Kiyoshi  Univ. of Tokyo Fac. of Pharm. Sci. Assoc. prof., 薬学部, 助教授 (50114575)

Project Period (FY) 1989 – 1990
Keywordspodophyllotoxin / anticancer agent / synthesis / asymmetric synthesis / ligand / diether / bond formation / selectivity
Research Abstract

Design and synthesis of podophyllotoxin related compound with antitumor activity and development of a novel strategy for the enantioselective asymmetric reaction have been successfully achieved.
(1) Design and synthesis of azapodophyllotoxin
Substitution of a carbon atom by nitrogen atom alpha to the lactone carbonyl group of podophyllotoxin would be expected to solve the two problems, isomerization at the site and increase of electron density at the oxygen atom of the carbonyl group.
Synthesis of the designed target has been successfully carried out in the short steps starting from the corresponding amino acid.
(2) Development of the novel asymmetric reaction
An efficient asymmetric reaction relies on a rational design of three components complex constituted from organometallic reagent, substrate, and chiral ligand. We designed a model which has two stereocontrolling groups at the both sites of chelating heteroatoms up and down faces of the five membered chelate.
Realization of the model complex would come from coordination of organolithium to a chiral diether which would form an expected complex. Reaction of organolithium with alpha, beta-unsaturated imines or esters in the presence of the chiral diether provided the corresponding conjugate addition products in high enantiomeric excess and in absolute configuration predicted from three component complex model.
By employing a substoichiometric amount of the diether catalytic asymmetric carbon-carbon bond formation has also been realized in the reaction of aryllithiums with BHA esters of 1- and 2- naphthalenecarboxylic acid to provide the corresponding conjugate addition products in high ee.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] K.Tomioka,Y.Kubota: "Synthesis and Antitumor Activity of Azapodophyllotoxin Analogue" Tetrahedron Letters. 30. 2953-2954 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tomioka,Y.Kubota,K.Koga: "Efficient Stereoselective Syntheis of 2ーAzaー4^1ーdemethylー podophyllotoxin" J.Chem.Soc.,Chem.Commun.1622-1624 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tomioka,M.Shindo,K.Koga: "Novel Strategy of Using C_2 Symmetric Chiral Diether in the Enantioselective Conjugate Addition of Organolithium to Aldimine" J.Am.Chem.Soc.111. 8266-8268 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tomioka,M.Shindo K.Koga: "Reductive Generation of Aldehyde Metal Enolate from Ketene" J.Org.Chem.55. 2276-2277 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tomioka: "Asymmetric Synthesis Utilizing External Chiral Ligands" Synthesis. 541-549 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tomioka,M.Shindo,K.Koga: "Conjugate Addition reaction of Organolithiums to Naphthalenecarboxylate" Tetrahedron Letters. 31. 1739-1741 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Tomioka, Y. Kubota, K. Koga: "Synthesis and Antitumor Activity of Azapodophyllotoxin" Tetrahedron Letters. 30. 2953-2954 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Tomioka, Y. Kubota, K. Koga: "Efficient Stereoselective Synthesis of 2-Aza-4'-demethy1-podophyllotoxin" Chem. Commun.1622-1624 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Tomioka, M. Shindo, K. Koga: "Novel Strategy of Using C_2 Symmetric Chiral Diether in the" J. Am. Chem. Soc.111. 8266-8268 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Tomioka, M. Shindo, K. Koga: "Reductive Generation of Aldehyde Metal Enolate" J. Org. Chem.55. 2276-2277 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Tomioka: "Asymmetric Synthesis Utilizing External Chiral Ligands" Synthesis. 541-549 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Tomioka, M. Shindo, K. Koga: "Conjugate Addition Reaction of Organolithiums to Naphthalenecarboxylate" Tetrahedron Letters,. 31. 1739-1741 (1990)

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

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Published: 1993-08-12  

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