Aldol-crotonic condensation of allobetulone and betulonic aldehyde with N-substituted pyrrole-2and pyrazole-4-carbaldehydes afforded a series of new α,β-unsaturated ketones of lupane series. Their reduction provided 2-ylidene derivatives of allobetulin and betulin, potential chiral components of liquid crystal materials. Structures of 1were established by X-ray diffraction (XRD) study .
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