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See Supporting Information for full details.
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29
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3N in anhydrous chloroform, and then 2-chloro-1-methylpyridinium iodide (4) was added. When the mixture became clear at 40°C, imine was added, and the reaction mixture was stirred at reflux for 2 h.
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0141805370
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note
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During optimization, the major drawback was the formation of the amide 7 that can be formed by hydrolysis of the intermediates C or D (Scheme 2). Although strict anhydrous conditions are not required, the use of dry chloroform and rubber septa generally prevents this side reaction.
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