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Preparation of nitrogen-containing pi-deficient heteroaromatic Grignard reagents: Oxidative magnesiation of nitrogen-containing pi-deficient halogenoheteroaromatics using active magnesium
The oxidative magnesiation of nitrogen-containing pi-deficient halogenoheteroaromatics using active magnesium was accomplished. Both magnesiation followed by addition of a carbonyl compound (Grignard reaction) and magnesiation in the presence of a carbonyl compound (Barbier reaction) were carried out to afford the corresponding product. Especially, the latter method enabled fused halogenodiazines such as 4-chloro-1-phenyl-1H-pyrazolo[3,4-d]pyrimidine or 2-chloroquinoxaline to magnesiate at a mild temperature (-20 to 30 C).
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Reference£º
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N700 | ChemSpider