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6-Allyloxypurines readily undergo palladium-catalysed Claisen rearrangement under mild conditions affording N1-substituted hypoxanthines. In contrast with the previously reported protocol, the Claisen rearrangement can be performed using Pd(PPh3)4 or Pd(dba)2/dppf in dry THF at 60°C. The reaction can accommodate variously substituted allyl fragments to position N1 of the hypoxanthine skeleton with...
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