addition of secondary amines to α,β- or β,β-disubstituted α,β-unsaturated esters was efficiently achieved under high pressure (10-16 kbar) in protic solvents in the absence of any catalyst. The expected cumbersome β-aminesters bearing a tertiary amine directly connected to a quaternary carbon atom could be isolated in fair to good yields. By using α,β,δ,γ,-unsaturated esters (alkyl sorbate), the addition
Diarylborinic Acid Derivatives as a Catalytic Iminium Ion Generator in the Mannich-Type Reaction Using Secondary Amines, Aldehydes, and Ketene Silyl Acetals
作者:Michinori Suginome、Yusuke Tanaka、Tomoaki Hasui
DOI:10.1055/s-2008-1072724
日期:2008.5
Reactions of secondary amines, aldehydes, and ketene silyl acetals were efficiently promoted by catalytic amounts of diarylborinic acid esters, Ar 2 B(OR), affording β-amino esters selectively with no formation of the corresponding β-hydroxy esters.
催化量的二芳基硼酸酯 Ar 2 B(OR) 有效地促进了仲胺、醛和乙烯酮甲硅烷基缩醛的反应,选择性地提供了 β-氨基酯,而不会形成相应的 β-羟基酯。
Potassium Channel Inhibitors
申请人:Dinsmore J. Christoph
公开号:US20080090794A1
公开(公告)日:2008-04-17
The present invention relates to compounds having the structure
useful as potassium channel inhibitors to treat cardiac arrhythmias, and the like.