Synthesis of N,N-Bis(nonaflyl) Squaric Acid Diamide and its Application to Organic Reactions
作者:Cheol-Hong Cheon、Hisashi Yamamoto
DOI:10.5012/bkcs.2010.31.03.539
日期:2010.3.20
of a new Bronsted acid based on the squaric acid scaffold carrying two nonafluorobutanesulfonyl (Nf) groups and the preliminary results of its reactivity to various organic reactions.Squaric acid diamide
A new Brønsted acid derived from squaric acid and its application to Mukaiyama aldol and Michael reactions
作者:Cheol Hong Cheon、Hisashi Yamamoto
DOI:10.1016/j.tetlet.2009.03.060
日期:2009.7
of silyl enol ether. The Brønsted acid was further applied to Mukaiyama Michael reaction of α,β-unsaturated ketones. It is noted that catalyst loading of all Mukaiyamareactions was only 1 mol % or less, which demonstrated the high reactivity of this acid. Mechanistic studies implied that the Mukaiyamaaldolreaction might proceed through Brønsted acid catalysis, rather than through Lewisacid catalysis
<i>N</i>-Triflylthiophosphoramide Catalyzed Enantioselective Mukaiyama Aldol Reaction of Aldehydes with Silyl Enol Ethers of Ketones
作者:Cheol Hong Cheon、Hisashi Yamamoto
DOI:10.1021/ol100233t
日期:2010.6.4
The first Brønsted acid catalyzed asymmetric Mukaiyama aldol reaction of aldehydes using silylenolethers of ketones as nucleophiles has been reported. A variety of aldehydes and silylenolethers of ketones afforded the aldol products in excellent yields and good to excellent enantioselectivities. Mechanistic studies revealed that the actual catalyst may be changed from the silylated Brønsted acid
A Bronsted acid mediated N-O bond clevage for direct [small alpha]-amination of ketones has been developed through nitroso aldol reaction of less-reactive aromaticnitrosocompounds and silyl enol ethers having disilane...
The Mukaiyama aldol reaction of in situ generated nitrosocarbonyl compounds: selective C–N bond formation and N–O bond cleavage in one-pot for α-amination of ketones
A practical protocol for the α-amination of ketones (up to 99% yield) has been developed via the Mukaiyama aldol reaction of in situ generated nitrosocarbonyl compounds.