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Four isoquinolone alkaloids, N-methylcorydaldine, 8a oxyhydrastinine 8b, 6,7-dimethoxy-2-methylisocarbostyril 9a and doryanine 9b, have been efficiently synthesized from phenyl vinyl sulfoxide via the Pummerer type rearrangement as a key step.
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Lee et al. (1992) studied this question.
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