[4+2] Cycloaddition reaction proceeds between N-aryl Schiff's bases and 1-alkenyl sulfides, a 1,2-propadienyl sulfide, or 1-alkynyl sulfides in the presence of BF 3 .OEt 2 to provide 2-substituted quinoline derivatives. A 2-alkyl-4-quinolone alkaloid, leptomarine, is prepared by applying the present cycloaddition reaction
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Narasaka et al. (1993) studied this question.
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