Dual nucleophilic catalysis with DABCO for the N-methylation of indoles |
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Authors: | Shieh Wen-Chung Dell Steven Bach Andrew Repic Oljan Blacklock Thomas J |
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Institution: | Chemical and Analytical Development, Novartis Institute for Biomedical Research, East Hanover, New Jersey 07936, USA. wen.shieh@pharma.novartis.com |
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Abstract: | DABCO is an extremely active catalyst for the methylation of indoles in conjunction with dimethyl carbonate (DMC). This green chemistry is highly effective and produces N-methylindoles in nearly quantitative yields. The reaction sequence consists of competing alkylation and acylation pathways and involves 1,4-diazabicyclo2.2.2]octane (DABCO) dually as a nucleophilic catalyst, ultimately resulting in a single product: the N-methylated indole. |
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