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Thus, we intended to examine systematically on theindium mediated Barbier reaction of ninhydrin and isatinwith allyl bromide, methallyl bromide and benzyl bromide.The reaction of ninhydrin (1) and benzyl bromide occurredat the 2-position of ninhydrin selectively to give 2a in 39%yield. We used typical experimental conditions for theindium-mediated Barbier reactions: Use of indium metal inthe presence of sodium iodide in N,N-dimethylformamide.

Indium Mediated Barbier Reaction of Ninhydrin and Isatin