Complete NMR Chemical Shift Assignments for Three Serratane Triterpenoids Isolated from Moss Homalia Trichomanoides
扁枝藓中锯齿石松烷型三萜的NMR化学位移全归属

The chemical structures of three serratane type triterpenoids isolated from the moss Homalia trichomanoides (Hedw.) B. S. G. were elucidated as 3α-methoxyserrat-14-en-21β-ol (1), 3β-methoxy-serrat-14-en-21β-ol (2) and 3β-methoxyserrat-14-en-21-one (3). Their 1H and 13C chemical shifts were assigned using 1D and 2D NMR spectroscopy (including 1H-1H COSY, HMQC and HMBC). Stereochemistry of C-3 for the three compounds and that of C-21 for compounds 1 and 2 were determined by coupling patterns in the 1H NMR spectra.