Synthesis of 6-substituted tetrahydropyridinones and cyclization to indolizidine and quinolizidine structures
作者:Shang-Shing P. Chou、Hao-Chieh Chiu、Chia-Cheng Hung
DOI:10.1016/s0040-4039(03)01096-7
日期:2003.6
3-Sulfolenes 1 with various substituents at C-2 underwent [4+2] cycloaddition reactions with p-toluenesulfonyl isocyanate to give the teterahydropyridinones 4. Through N-detosylation and Hg(II)-mediated electrophilic addition/intramolecular cyclization of 4e and 4f, the indolizidine and quinolizidine compounds 7a/7b and 8 were synthesized, respectively.
Tandem cross metathesis and intramolecular aza-Michael reaction to synthesize bicyclic piperidines and indolizidine 167E
作者:Shang-Shing P. Chou、Jhih-Liang Huang
DOI:10.1016/j.tetlet.2012.08.031
日期:2012.10
We have successfully transformed the terminal alkenes of dihydropyridones to the alpha,beta-unsaturated esters by cross metathesis (CM). After detosylation the secondary amides can undergo the intramolecular aza-Michael reaction to give the bicyclic piperidine structures. The stereoselectivity of the aza-Michael reaction is determined by the size of the newly formed ring. With simple transformations we have also achieved the synthesis of indolizidine 167E. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis and Applications of Tetrahydro-2-pyridinones via aza-Diels-Alder Reactions of Thio-substituted 1,3-Dienes with Arylsulfonyl Isocyanates
作者:Shang-Shing Chou、Chia-Cheng Hung
DOI:10.1055/s-2001-18710
日期:——
The first aza-Diels-Alder reactions of arylsulfonyl isocyanates with thio-substituted 1,3-dienes via the 3-sulfolene precursors 1 gave the cyclized products 3 with complete control of chemo- and regioselectivity. The cyclized products 3a and 5 underwent further reactions with nucleophiles and bases to give useful heterocyclic compounds. The N-tosyl group of the cyclic products could be selectively replaced by hydrogen or another substituent.