Provided is a heterocyclic compound having a superior RBP4-lowering action and useful as a medicament for the prophylaxis or treatment of a disease or symptom mediated by an increase in RBP4 or retinol supplied by RBP4. A compound represented by the formula (I):
wherein each symbol is as defined in the Description, or a salt thereof has a superior RBP4-lowering action, and is useful as a medicament for the prophylaxis or treatment of a disease or symptom mediated by an increase in RBP4 or retinol supplied by RBP4.
Microwave-assisted rapid electrophilic fluorination of 1,3-dicarbonyl derivatives with Selectfluor®
作者:Ji-Chang Xiao、Jean’ne M. Shreeve
DOI:10.1016/j.jfluchem.2004.10.043
日期:2005.4
A microwave-assisted fluorination method for 1,3-dicarbonyl compounds using Selectfluor® has been developed. 2-Monofluorinated products can be obtained in high yield in neutral reaction conditions with addition of 1 eq. of Selectfluor®. Treatment of 1,3-dicarbonyls with 3 eq. of Selectfluor® in the presence of tetrabutylammonium hydroxide (TBAH) as the base results in the formation of 2,2-difluorinated
Nucleophile-Directed Stereocontrol Over Glycosylations Using Geminal-Difluorinated Nucleophiles
作者:Benjamin Schumann、Sharavathi G. Parameswarappa、Marilda P. Lisboa、Naresh Kottari、Fabio Guidetti、Claney L. Pereira、Peter H. Seeberger
DOI:10.1002/anie.201606774
日期:2016.11.7
close proximity to the hydroxy group of an aliphatic amino alcohol lowers the oxygen nucleophilicity and reverses the stereoselectivity of glycosylations to preferentially form the desired cis‐glycosides with a broad set of substrates. This concept was applied to the design of a cis‐selective linker for automated glycan assembly. Fluorination of an amino alcohol linker does not impair glycan immobilization