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Chinese Science Bulletin

, Volume 43, Issue 11, pp 917–921 | Cite as

Mechanism of intramolecular mixed anhydride formation as intermediates in the reactions of N-phosphorylamino-acids —An MNDO research

  • Zhong Rugang
  • Zhao Yufen
  • Dai Qianhuan
Bulletin

Abstract

N-phosphoryl-α-amino acids can react to form esters, peptides, phosphoryl ester-exchanged products and phosphoryl group migration products under mild conditions, which are very important in researches on arohebiont. It has been proposed that intramolecular mixed carboxylic-phosphoric anhydrides (IMCPAs) might be the common intermediates of the reactions, which are difficult to be experimentally observed because of their high activity. In this note, it has been revealed, by means of MNDO, that the IMCPAs arc situated at the relatively minimal points of the potential surface and can form in a non-synchronous concerted reaction pathway that passes through a transition state with a hydrogen-bond-bridge structure. The results give a successful explanation to the structure and formation of IMCPAs and their ability to promote the various reactions mentioned above.

Keywords

N-phosphorylamino-acid intramolecular mixed anhydride mechanism MNDO 

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Copyright information

© Science in China Press 1998

Authors and Affiliations

  • Zhong Rugang
    • 1
    • 2
  • Zhao Yufen
    • 1
  • Dai Qianhuan
    • 2
  1. 1.Bioorganic Phosphorus Chemistry Laboratory, Department of ChemistryTsinghua UniversityBeijingChina
  2. 2.Center for Chemistry and Bioengineering of Cancer ResearchBeijing Polytechnic UniversityBeijingChina

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