Stereoselective Synthesis of Enantipure β-Amino Alcohols via Nucleophilic β-Amino-α-hydroxyalkylation by Means of 1-Lithiated 2-[N-(Diphenylmethyleneamino)]alkyl Carbamates
Stereoselective Synthesis of Enantipure β-Amino Alcohols via Nucleophilic β-Amino-α-hydroxyalkylation by Means of 1-Lithiated 2-[N-(Diphenylmethyleneamino)]alkyl Carbamates
Stereoselective Synthesis of Enantipure β-Amino Alcohols via Nucleophilic β-Amino-α-hydroxyalkylation by Means of 1-Lithiated 2-[N-(Diphenylmethyleneamino)]alkyl Carbamates
作者:Christiane Boie、Dieter Hoppe
DOI:10.1055/s-1997-1155
日期:1997.2
2-[N-(Diphenylmethyleneamino)]alkyl carbamates are deprotonated by means of sec-butyllithium in the presence of TMEDA or (-)-sparteine and the diastereomeric ion pairs of α-oxycarbanions formed are substituted by several electrophiles. Deprotection proceeds smoothly to yield chain-elongated β-amino alcohols. Problems arise due to nucleophilic attack of the alkyllithium at one aryl ring of the benzophenone imines under certain reaction conditions.