There are provided novel compounds of formula (I) wherein R
1
, R
2
, R
3
, R
4
and R
5
are as defined in the Specification and optical isomers, racemates and tautomers thereof and pharmaceutically acceptable salts thereof; together with processes for their preparation, compositions containing them and their use in therapy. The compounds are inhibitors of the enzyme nitric oxide synthase.
There are provided novel compounds of formula (I) wherein R?1, R2, R3, R4 and R5¿ are as defined in the Specification and optical isomers, racemates and tautomers thereof and pharmaceutically acceptable salts thereof; together with processes for their preparation, compositions containing them and their use in therapy. The compounds are inhibitors of the enzyme nitric oxide synthase.
Effect of acid catalysis on the direct electrophilic fluorination of ketones, ketals, and enamides using Selectfluor™
作者:Jack Liu、Johann Chan、Craig M. Bryant、Petar A. Duspara、Ernest E. Lee、David Powell、Hua Yang、Ziping Liu、Chris Walpole、Edward Roberts、Robert A. Batey
DOI:10.1016/j.tetlet.2012.03.074
日期:2012.6
The fluorination of ketones, ketals, and enamides has been achieved using the electrophilic fluorinating reagent Selectfluor™ (F-TEDA-BF4). For the reactions of ketones and ketals the use of sulfuric acid (0.1 equiv) as an additive was found to facilitate the reaction leading to more rapid product formation. This behavior is analogous to the known effects of acid catalysis on the bromination of ketones