Compound 3 showed a positive specific
rotation [+71 (c 0.06, CHCl3)], in contrast to the related compounds
tajixanthone hydrate [-72 (c 2.3, CHCl3)]13 and tajixanthone
methanoate [-76 (c 0.23, CHCl3)],3 which were reported to have
an S configuration at C-15. Assuming that the configurations at
C-20 and C-25 in 3 are the same as in 1 and 2, this implies that
C-15 of 3 has the R configuration.
Compound 3 showed a positive specificrotation [+71 (c 0.06, CHCl3)], in contrast to the related compoundstajixanthone hydrate [-72 (c 2.3, CHCl3)]13 and tajixanthonemethanoate [-76 (c 0.23, CHCl3)],3 which were reported to havean S configuration at C-15. Assuming that the configurations atC-20 and C-25 in 3 are the same as in 1 and 2, this implies thatC-15 of 3 has the R configuration.
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