Starting from (-)-camphor-10-sulfonic acid (5) the crystalline sultam 9 was readily prepared. TiCl₄-mediated Diels-Alder addition of the N-crotonoyl sultam 11 to cyclopentadiene, crys- tallization of the resulting adduct 12 and subsequent reduction gave virtually pure (1S, 4R, 5R, 6S)-1 together with recovered auxiliary 9. The loganin precursor 1 was transformed into norbornanone 20, which upon Baeyer-Villiger oxidation led to the suitably substituted cyclo- pentane 22 from which 1-B-O-methyl loganin aglucone (2) was readily available.