The synthesis of the title compounds (10) and (16) in eleven and ten steps respectively from the imine (1) and 2-trimethylsilyloxycyclohexa-1,3-diene (2)via the azabicyclo-octanone (3) and the triol (5) illustrates a new general method for the preparation of the prosopis alkaloids.
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Holmes et al. (1985) studied this question.