A one-pot formal [4 + 2] cycloaddition approach to substituted piperidines, indolizidines, and quinolizidines. Total synthesis of indolizidine (-)-209I

Article abstract of DOI:10.1021/jo051080y

Heating a mixture of substituted N-benzyl γ-chloropropylamines, conjugated alkynoates or alkynones, sodium carbonate, and a catalytic amount of sodium iodide in i-PrOH at 70-83 °C delivers substituted piperidines in good yields. This transformation goes t