α-Alkylation, tert-butyl 2-((diphenylmethylene)amino)acetate, benzylbromide, tert-butyl (S)-2-((diphenylmethylene)amino)-3-phenylpropanoate, (8α,9R)-(8′′α,9′′R)-1,1′′-[1,5-naphthalenediylbis(methylene)]bis[10,11-dihydro-9-(2-propenyloxy)-Cinchonanium dibromide, Dihydrocinchonidine Derivative

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