The Journal of organic chemistry

Regioselective Introduction of Electrophiles in the 4-Position of 1-Hydroxypyrazole via Bromine-Lithium Exchange

T Balle, P Vedsø, M Begtrup

文献索引：Elguero, Jose; Jaramillo, Carlos; Pardo, Carmen Synthesis, 1997 , # 5 p. 563 - 566

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被引用次数: 12

摘要

... Addition of Et 2 O (50 mL), separation of the organic layer, extraction of the aqueous phase five times with ether, drying of the combined organic phases (MgSO 4 ), filtration, and evaporation gave 4.88 g of a mixture of 4-bromo-1-hydroxypyrazole (5), dibrominated 1 ...