Asymmetric Fluorination of α-Branched Cyclohexanones Enabled by a Combination of Chiral Anion Phase-Transfer Catalysis and Enamine Catalysis using Protected Amino Acids
作者:Xiaoyu Yang、Robert J. Phipps、F. Dean Toste
DOI:10.1021/ja500882x
日期:2014.4.9
cycles operating together in a matched sense, high enantioselectivites can be achieved, and we envisage that this dual catalysis method has the potential to be more broadly applicable, given the breadth of enaminecatalysis. It also represents a rare example of chiral enaminecatalysis operating successfully on α-branched ketones, substrates commonly inert to this activation mode.
COMPOUNDS FOR THE REDUCTION OF BETA-AMYLOID PRODUCTION
申请人:Boy Kenneth M.
公开号:US20120028994A1
公开(公告)日:2012-02-02
The present disclosure provides a series of compounds of the formula (I)
which modulate β-amyloid peptide (β-AP) production and are useful in the treatment of Alzheimer's Disease and other conditions affected by β-amyloid peptide (β-AP) production.
A general gamma-C(sp(2))-H iodination method directed by an aliphatic keto group has been developed under transition-metal-free conditions for the first time, generating iodoarenes in good to excellent yields with excellent site selectivity. This protocol features a wide range of aryl-substituted ketones, short reaction times, mild reaction conditions, and scalable synthetic procedures. A possible reaction mechanism was also proposed based on several control experiments.
COMPOUNDS FOR THE REDUCTION OF ß-AMYLOID PRODUCTION