DABCO-Catalyzed Reaction of Phenols or 1,2-Diphenols with Activated Alkynes Leading to the Formation of Alkenoic Acid Esters or 1,3-Dioxole Derivatives
作者:Yong-Min Liang、Ming-Jin Fan、Gao-Qiang Li、Lian-Hua Li、Shang-Dong Yang
DOI:10.1055/s-2006-942437
日期:——
The reaction of phenols or 1,2-diphenols with activated alkynes took place smoothly and rapidly in the presence of a catalytic amount of 1,4-diazabicyclo[2.2.2] octane (DABCO) at room temperature and resulted in the formation of various alkenoic acid esters or 1,3-dioxole derivatives in excellent yields. The scope and limitations, together with a plausible mechanism of the reaction are disclosed in
Benzopyran-2-carboxylic acids in the prevention of asthmatic symptoms
申请人:Fisons Limited
公开号:US03952104A1
公开(公告)日:1976-04-20
There are described certain mono-chromone-2-carboxylic acids of formula, ##SPC1## Having one substituent in the 5 or 6 position or having 2 or more substituents in the 5,6,7 or 8 positions. There are also described processes for making the compounds and pharmacetuical compositions, for the treatment of asthma, containing the compounds.
6,8-Di-t-butyl-4-oxo-4H-1-benzopyran-2-carboxylic acid and derivative
申请人:Fisons Limited
公开号:US04055654A1
公开(公告)日:1977-10-25
There are described certain mono-chromone-2-carboxylic acids of formula, ##STR1## having one substituent in the 5 or 6 position or having 2 or more substituents in the 5,6,7 or 8 positions. There are also described processes for making the compounds and pharmaceutical compositions, for the treatment of asthma, containing the compounds.