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Last of the gem-Difluorocycloalkanes: Synthesis and Characterization of 2,2-Difluorocyclobutyl-Substituted Building Blocks

J. Org. Chem. 2019, 84 (13), 8487-8496

DOI: 10.1021/acs.joc.9b00719

Chernykh A.; Melnykov K.; Tolmacheva N.; Kondratov I.; Radchenko D.; Daniliuc C.; Volochnyuk D.; Ryabukhin S.; Kuchkovska Y.; Grygorenko O.

An efficient approach to synthesis of previously unavailable 2-substituted difluorocyclobutane building blocks was developed and applied on a multigram scale. The key step of the synthetic sequence included deoxofluorination of O-protected 2-(hydroxylmethyl)cyclobutanone. Dissociation constants (pKa) and log P values for 2,2-difluorocyclobutaneamine and 2,2-difluorocyclobutanecarboxylic acid or their derivatives were measured and compared with the values obtained for the corresponding 3,3-difluorocyclobutane derivatives and nonfluorinated counterparts. Three-dimensional structures of 2,2- and 3,3-difluorocyclobutanamines were compared using exit vector plot analysis of X-ray crystallographic data.

Last of the gem-Difluorocycloalkanes: Synthesis and Characterization of 2,2-Difluorocyclobutyl-Substituted Building Blocks

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