The synthesis of 3 -aryl-N-n-propyl-piperidines is described in six steps starting from a-sulfonyl acetamide via the formal [3+3] cycloaddition reaction of the latter into glutarimide. The pathway involves an efficient cycloaddition and regioselective reduction, and yields useful building blocks for heterocyclic chemistry. (C) 2002 Elsevier Science Ltd. All rights reserved.
The synthesis of 3 -aryl-N-n-propyl-piperidines is described in six steps starting from a-sulfonyl acetamide via the formal [3+3] cycloaddition reaction of the latter into glutarimide. The pathway involves an efficient cycloaddition and regioselective reduction, and yields useful building blocks for heterocyclic chemistry. (C) 2002 Elsevier Science Ltd. All rights reserved.
One-pot facile conversion of Baylis–Hillman adduct into N-alkyl 3-(E)-alkylidene-5-substituted sulfonylpiperidine-2,6-dione. Formal synthesis of tacamonine
stepwise [3+3] strategy to N-alkyl 3-(E)-alkylidene-5-substituted sulfonylpiperidine-2,6-dione 1 used various N-alkyl α-substituted sulfonylacetamides 2 and α,β-unsaturated esters 3 as starting materials. α,β-Unsaturated esters 3 were generated by Baylis–Hillman reaction. A ring closure mechanism was proposed for the reactions. This method provides a convenient formal synthesis of tacamonine.