effective chiral dialkylsulfide organocatalysts remain relatively rare and under‐developed, despite the potential utility of dialkylsulfide catalysts. Herein, we report the development of chiral bifunctional dialkylsulfide catalysts possessing a urea moiety for regio‐, diastereo‐, and enantioselective bromolactonization. The importance of the bifunctional design of chiral sulfide catalysts was clearly
Trifluoroacetic acid catalyzed highly regioselective bromocyclization of styrene-type carboxylic acid
作者:Tao Chen、Ying-Yeung Yeung
DOI:10.1039/c6ob00756b
日期:——
A trifluoroaceticacid catalyzed highly 6-endo regioselective bromocyclization of styrene-type carboxylic acid has been developed. The resulting 3,4-dihydroisocoumarines are valuable building blocks in organic synthesis.
discovery of halolactone derivatives as efficient non-nucleosidereversetranscriptaseinhibitors (NNRTIs) and the study of their structure–activity relationships (SARs). Among the various halolactone derivatives, 5-exo lactone 3-(chloro(2-chlorophenyl)-methyl)isobenzofuran-1(3H)-one 13a showed excellent potency against WT HIV-1 in the reversetranscriptase gene with a low EC50 value of 0.45 μM. In most
2-(5H-dibenzo[a,d]cyclohepten-5-on-2-yl) acetic, propionic and butyric acids, and esters and salts thereof, are prepared by solvolysis of nitrile or amide intermediates, or of ketal-protected nitrile, amide, acid, ester or salt intermediates.
Intermediate in the oxidative process for the preparation of
申请人:Syntex (U.S.A.) Inc.
公开号:US04011243A1
公开(公告)日:1977-03-08
2-(5H-Dibenzo[a,d]cyclohepten-5-on-2-yl)acetic, propionic and butyric acids are prepared by oxidation of the corresponding 5-oxo- or ketal-protected oxoalcohols and aldehydes. The acid products exhibit anti-inflammatory, analgesic and anti-pyretic activity.