Stereoselective synthesis of unnatural spiroisoxazolinoproline-based amino acids and derivatives

Wei Chieh Cheng, Yannan Liu, Melissa Wong, Marilyn M. Olmstead, Kit Lam, Mark J. Kurth

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


A route to spiroisoxazolinoproline-based amino acid derivatives is reported in which exomethyleneprolinate 4 (tert-butyl ester) reacts as a dipolarophile with nitrile oxides to generate spiroisoxazolinoprolinates 7/10/11 in good yields (70-75%) and with ca. 1:4 cis:trans diastereoselectivity. tert-Butyl spiroisoxazolinoprolinates were separable by column chromatography and amenable to scale-up leading to single diastereoisomers of N-Boc and N-Fmoc protected spiroisoxazolinoproline amino acids.

Original languageEnglish (US)
Pages (from-to)5673-5677
Number of pages5
JournalJournal of Organic Chemistry
Issue number16
StatePublished - Aug 9 2002

ASJC Scopus subject areas

  • Organic Chemistry


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