Selective Mono-C-methylations of Arylacetonitriles and Arylacetates with Dimethylcarbonate: A Mechanistic Investigation
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چکیده
منابع مشابه
Selective mono-C-methylations of arylacetonitriles and arylacetates with dimethylcarbonate: a mechanistic investigation.
The very high mono-C-methylation selectivity (>99%) of arylacetic acid derivatives (ArCH2X; X = CN, CO2Me) with dimethyl carbonate (DMC) is due to a mechanism that involves consecutive methoxycarbonylation, methylation, and demethoxycarbonylation steps. Important aspects of this mechanism are clarified herein by a kinetic investigation. In the case of arylacetonitriles, at 140 degrees C, the co...
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15 صفحه اولSelective Mono Bromination of 1,4-Dihydropyridines
2-monobromomethyl 1,4-dihydropyridines is selectively synthesized by bromination of the parent compound by 1.1 equivalents of pyridinium bromide perbromide in dichloromethane/pyridine at -20 °C. The same reagent in dichloromethane at 0 °C produce the 2,6-bis(bromomethyl) 1,4-dihydropyridines.
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ژورنال
عنوان ژورنال: The Journal of Organic Chemistry
سال: 2002
ISSN: 0022-3263,1520-6904
DOI: 10.1021/jo0057699