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
Reaction of heterocyclic enamines with nitrile oxide and nitrilimine precursors
作者:Cevher Altuğ、Yasar Dürüst、Mark C. Elliott、Benson M. Kariuki、Tillique Rorstad、Mark Zaal
DOI:10.1039/c0ob00286k
日期:——
Alkylidenepyrrolidines 1, 21, 24 and 26 undergo reactions with nitrile oxides and nitrilimines or their precursors to give a range of novel heterocycliccompounds. With alkylidenepyrrolidine ester 1, nitrolic acids give products in which the liberated nitrous acid reacts with the alkylidenepyrrolidine, followed by two cycloadditions to give adducts 3. In contrast, hydroximoyl chlorides give isoxazoles