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Attachment of the Boc group to pyrrole nitrogen can now be achieved by a universally applicable method. Preparation of the N-Boc derivatives 1 from the corresponding pyrroles has been accomplished with Boc2O in presence of the strong acylating catalyst 4-dimethylaminopyridine in CH3CN or CH2Cl2 at room temperature. A wide variety of substituents R1—R4 can be used.
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Grehn et al. (1984) studied this question.
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