A series of substituted 5,6,7,8-tetrahydroquinoline-8-carboxylic esters have been prepared by the reaction of the 8-lithio- and 8-magnesio-derivatives of 5,6,7,8-tetrahydroquinolines with carbon dioxide followed by esterification. The esters were converted into the corresponding amides, nitriles, and thioamides.
R. Crossley, A. C. W. Curran and D. G. Hill, J. Chem. Soc., Perkin Trans. 1, 1976, 977 DOI: 10.1039/P19760000977
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