The (E)- and (Z)-vinyl sulphoxides (3) and (4) upon treatment with base, undergo cyclization to give chiral isoquinolines one of which was converted into (R)-(+)-carnegine.
S. G. Pyne and S. L. Chapman, J. Chem. Soc., Chem. Commun., 1986, 1688 DOI: 10.1039/C39860001688
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