3,3-Diarylsuccinic acids 4 were prepared from diaryl ketones by the Knoevenagel condensation with ethyl cyanoacete followed by KCN addition and hydrolysis.These were cyclised using primary amines to the respective diarylpyrrolidones 7, which were finally reduced to 3,3diarylpyrrolidines using BH 3 .THF.
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Katritzky et al. (2003) studied this question.