Lithiated β-aminoalkyl sulfones as mono and dinucleophiles in the preparation of nitrogen heterocycles: Application to the synthesis of capsazepine
作者:Diego A. Alonso、Ana Costa、Balbino Mancheño、Carmen Nájera
DOI:10.1016/s0040-4020(97)00163-4
日期:1997.3
lithiation of N-benzyl-β-tosylethanamine (10a) and N-benzyl-α-phenyl-β-tosylethanamine (10b) with n-butyllithium at −78°C leads to monoanions 11a and 11b, respectively. Intermediates 11 react with different monoelectrophiles (D2O, alkyl halides, and carbonyl compounds) at the α-position with respect to the sulfone, and with dielectrophiles (1,3-, 1,4-dihalides, α-bromoacetates, and α-chloroketones) to afford