1,4-Bis(arylsulfonyl)-1,2,3,4-tetrahydropyridines in Synthesis. Intramolecular Alkylation Reactions and Stereoselective Synthesis of Anti-2,6-Disubstituted Piperidines
作者:Donald Craig、Raymond McCague、Gerard A. Potter、Meredith R. V. Williams
DOI:10.1055/s-1998-1567
日期:1998.1
1,4-Bis(arylsulfonyl)-1,2,3,4-tetrahydropyridines 1 having R1 containing aromatic groups undergo intramolecular electrophilic aromatic substitution reactions to give benzo-fused bicyclo[3.3.1] systems with chemoselectivities which depend on the nature of the acidic reagent used. Cationic hydrogenation of the C-5-C-6 double bond in substrates 1 substituted at C-6 provides an entry to anti-2,6-disubstituted piperidines upon desulfonylation.
1,4-双(芳基磺酰基)-1,2,3,4-四氢吡啶化合物1中含有芳香基团的R1会发生分子内电亲性芳香取代反应,生成苯并融合的双环[3.3.1]体系,其化学选择性取决于所使用的酸性试剂的性质。在C-6位取代的底物1中,对C-5-C-6双键进行阳离子氢化后,去磺酸化可获得反式-2,6-二取代哌啶。