Abstract
The 1,4-conjugate addition of indoles 2 to various vinyl ketones 1 took place in the presence of an ILIS-SO2Cl (20 mol%) to give the corresponding 3-substituted indoles 3 with up to 93% yield (12 examples). This catalyst was separated from the reaction mixture by centrifugation, and reused fives times in the conjugate addition of indole to 3-buten-2-one (79-93% yield). Decrease in catalytic activity was regained by treating the recovered ILIS-SO2Cl with hot thionyl chloride.
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