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has been cited by the following article:

• TITLE: An Efficient Synthesis of 2,3-Diaminoacid Derivatives Using Phosphine Catalyst

  AUTHORS: Yohei Oe, Hiroaki Kishimoto, Nahoko Sugioka, Daisuke Harada, Yukio Sato, Tetsuo Ohta, Isao Furukawa

  KEYWORDS: Addition, Alkynes, Amino Acids, Catalysis, Multi-Component Reaction

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.4 No.3, September 17, 2014

  ABSTRACT: Ethyl 2,3-diphthalimidoylpropanoate was effectively synthesized from ethyl propynoate with two equivalents of phthalimide catalyzed by triphenylphosphine in good yield. The choice of reaction media was important for selective synthesis of the desired 2,3-diaminocarboxylic acid derivatives. The reaction is considered to occur through a zwitterionic intermediate derived from the reaction of the α,β-unsaturated ester with triphenylphosphine.