B. ChitkulY. PinyopronpanichC. ThebtaranonthY. ThebtaranonthW. C. TaylorMahidol UniversityThe University of Sydney2018-02-272018-02-271994-02-14Tetrahedron Letters. Vol.35, No.7 (1994), 1099-1102004040392-s2.0-0028354367https://repository.li.mahidol.ac.th/handle/123456789/9517Spiro[4.4]non- and spiro[4.5] dec-2-ene-1,6-diones [2; n = 0 and 1] were prepared in moderate to high enantiomeric purities via asymmetric allylation of enamines 6 and ketal derivatives 7 and 8 formed from keto-esters 5, followed by a carbanionic cyclization process. © 1994.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyChemistryPharmacology, Toxicology and PharmaceuticsArticleSCOPUS10.1016/S0040-4039(00)79975-8