(−)-Sparteine-Mediated α-Lithiation of N-Boc-N-(p-methoxyphenyl)benzylamine: Enantioselective Syntheses of (S) and (R) Mono- and Disubstituted N-Boc-benzylamines
A Mechanistic and Structural Investigation of the (−)-Sparteine Mediated Asymmetric Benzylic Lithiation Substitution Reactions of <i>N</i>-Boc-<i>N</i>-(<i>p</i>-methoxyphenyl)benzylamine
作者:Neil C. Faibish、Yong Sun Park、Steven Lee、Peter Beak
DOI:10.1021/ja972225o
日期:1997.12.1
l)benzylamine (1) by n-BuLi/(−)-sparteine (6) arise from an enantioselective deprotonation of 1 to provide configurationally stable (R)-2/6. NMR spectroscopy establishes that 13C, 6Li labeled (R)-2/6 and (S)-2/6 are monomeric with lithium complexed to the benzylic position, the carbonyl of the Boc group and (−)-sparteine. Deprotonations of the tertiary protons in (R)- and (S)-N-Boc-N-(p-methoxyphe
(−)-Sparteine-Mediated α-Lithiation of <i>N</i>-Boc-<i>N</i>-(<i>p</i>-methoxyphenyl)benzylamine: Enantioselective Syntheses of (<i>S</i>) and (<i>R</i>) Mono- and Disubstituted <i>N</i>-Boc-benzylamines