Synthesis of tert-butylcyclopentane-fused 1,3-oxazines and 1,3-thiazines

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Chlorosulphonyl isocyanate (CSI) addition to 4-tert-butylcyclopentene furnished the azetidinone (3) in a stereospecific reaction. Azetidinone 3 was transformed by ring opening esterification and lithium aluminium hydride (LAH) reduction to the 2-hydroxymethyl-4-tert-butyl-1-cyclopentylamine (6). The N-methyl-aminoalcohol (8) was prepared from amino esters (5) with ethyl chloroformate and subsequent LAH reduction. By different ring-closure methods, a number of tert-butyl-cyclopentante-fused 1,3-oxazines and 1,3-thiazines were synthesized. A comparative study of the prepared compounds was performed by IR, 1H- and 13C-NMR, DEPT and DNOE measurements.

Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalActa pharmaceutica Hungarica
Issue number5
Publication statusPublished - Jan 1 1994

ASJC Scopus subject areas

  • Pharmaceutical Science

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