期刊
TETRAHEDRON-ASYMMETRY
卷 13, 期 16, 页码 1761-1767出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0957-4166(02)00476-7
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Starting from (+)-3-carene 1 several spirolactones with carane backbone were synthesized. delta-Hydroxy-gamma-lactone 5 was obtained by acidic lactonization of a gamma,delta-epoxy ester. Iodolactone 8 and bromolactone 9 were products of iodolactonization of gamma,delta-unsaturated acid 7 and bromolactonization of gamma,delta-unsaturated ester 3 respectively. The halo lactones were subjected to reductive dehalogenation with tributyltin hydride and dehydrohalogenation with DBU. The structures of the lactones obtained were confirmed by X-ray analysis and spectral data. (C) 2002 Elsevier Science Ltd. All rights reserved.
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