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
烷基苯基砜3是合适的合成子,用于以良好至中等的产率合成2-苯基磺酰基亚烷基吡咯烷或哌啶衍生物1。首先使烷基砜锂4与所需的被保护的内酰胺反应,然后进行酸性甲醇分解,得到不寻常的烯胺1a-e。NMR研究(COSY 1 H- 1 H,COZY 1 H- 13 C,NOE)显示Z烯胺与相应的亚胺2动态平衡存在。通过分子计算证实了所述化合物的立体化学。