Synthesis of functionalized cyclic enamines from lithium alkylphenyl sulfones and<i>N</i>-carbo-<i>tert</i>-butoxy lactams
作者:Luis A. Arias、David Arbelo、Arnaldo Alzérreca、José A. Prieto
DOI:10.1002/jhet.5570380104
日期:2001.1
pyrro-lidine or piperidine derivatives 1 in good to moderate yields. The lithium alkyl sulfones 4 are first reacted with the desired protected lactams and then subjected to acidic methanolysis to afford the unusual enam-ines 1a-e. NMR studies (COSY 1H-1H, COSY 1H-13C, NOE) showed the Z enamines to exist in a dynamic equilibrium with the corresponding imines 2. The stereochemistry of the described compounds