3-Alkoxycarbonyl-2-oxazolones and Their Homopolymers as Highly Preservable Amino-Protecting Reagents. tert-Butoxy-carbonylation and Benzyloxycarbonylation of Amino Groups

Takehisa Kunieda, Tsunehiko Higuchi, Yoshihiro Abe, Masaaki Hirobe

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Highly preservable amino protecting reagents derived from the 2-oxazolone moiety as a common activating mediator have been developed. 3-Alkoxycarbonyl-2-oxazolones serve as easily handled reagents for amino protection, including tert-butoxycarbonylation, benzyloxycarbonylation, p-methoxybenzyloxycarbonylation, methoxycarbonylation and ethoxycarbonylation. For example, high yield N-protection of α-amino acids has been smoothly performed by the use of 3-tert-butoxycarbonyl [Boc-Ox] and 3-benzyloxycarbonyl-2-oxazolones Cbz-Ox] in aqueous solution at room temperature. A series of homopolymers, poly(3-alkoxycarbonyl-2-oxazolone), is readily obtainable by radical-initiated chain reaction of the corresponding 4,5-unsubstituted oxazolone monomers (except for the tert-butoxy derivative, which failed to give polymeric compounds), and these were successfully used for amino protection as well. Use of the polymer reagents greatly simplifies the purification procedure, though a longer reaction time is required.

Original languageEnglish
Pages (from-to)2174-2181
Number of pages8
JournalChemical and Pharmaceutical Bulletin
Volume32
Issue number6
DOIs
Publication statusPublished - 1984
Externally publishedYes

Fingerprint

Oxazolone
Carbonylation
Homopolymerization
Purification
Polymers
Monomers
tert-butoxy
Derivatives
Amino Acids
Temperature

Keywords

  • 3-alkoxycarbonyl-2-oxazolone
  • 3-benzyloxycarbonyl-2-oxazolone
  • 3-tertbutoxycarbonyl-2-oxazolone
  • amino protection
  • poly(2-alkoxycarbonyl-2-oxazolone)

ASJC Scopus subject areas

  • Chemistry(all)
  • Drug Discovery

Cite this

3-Alkoxycarbonyl-2-oxazolones and Their Homopolymers as Highly Preservable Amino-Protecting Reagents. tert-Butoxy-carbonylation and Benzyloxycarbonylation of Amino Groups. / Kunieda, Takehisa; Higuchi, Tsunehiko; Abe, Yoshihiro; Hirobe, Masaaki.

In: Chemical and Pharmaceutical Bulletin, Vol. 32, No. 6, 1984, p. 2174-2181.

Research output: Contribution to journalArticle

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