Hydroacridines. Part 17—Stereospecific influence of the N+—O- group on1JC,C couplings in non-aromatic amine oxides
作者:Francisc Potmischil、Helmut Herzog、Joachim Buddrus
DOI:10.1002/(sici)1097-458x(199804)36:4<240::aid-omr260>3.0.co;2-9
日期:1998.4
The (1)J(C,C) coupling constants of N-epimeric pairs of amine oxides derived from (4a alpha, 8a beta, 9a beta, 10a alpha)- and (4a alpha, 8a alpha, 9a alpha, 10a alpha)-tetradecahydro-10-methylacridine, 1-cis-2,6-trimethylpiperidine and tropine were investigated and compared with those for the parent amines. For C-C bonds adjacent to the N+-O- group, the couplings depend on the mutual orientation of the N+-O- bond and the C-C bond of interest: with the N+-O- bond oriented sm (gauche), the couplings are essentially as large as those in the parent amines, whereas with the N+-O- bond oriented anti, the couplings are about 4-5 Hz smaller. The C-13 NMR chemical shifts of the N-CH3 carbons, from which the configurations of the N-epimeric amine oxides can be derived, are also reported. (C) 1998 John Wiley & Sons, Ltd.