Practically Perfect Asymmetric Autocatalysis with (2-Alkynyl-5-pyrimidyl)alkanols
摘要:
Extremely high enantioselectivity (>99.5% ee) and chemical yield (>99%) are achieved in an asymmetric autocatalytic reaction. A (5-pyrimidyl)alkanol with a tert-butylethynyl group at its 2-position (1) is a very efficient asymmetric autocatalyst in the enantioselective alkylation in Equation (1).
Amide derivatives as ion-channel ligands and pharmaceutical compositions and methods of using the same
申请人:Kelly G. Michael
公开号:US20060194801A1
公开(公告)日:2006-08-31
Compounds are disclosed that have a formula represented by the following:
The compounds may be prepared as pharmaceutical compositions, and may be used for the prevention and treatment of a variety of conditions in mammals including humans, including by way of non-limiting example, pain, inflammation, traumatic injury, and others.
left-handed circularlypolarizedlight (CPL) has been proposed as one of the origins of homochirality of biomolecules. However, the enantiomeric excess induced by CPL has been only very low (<2% ee). We found the unprecedented example of asymmetricautocatalysis triggered directly by a chiral physical factor, that is, right- and left-handed CPL, leading to a near enantiopure compound. Asymmetric photolysis
右手和左手圆偏振光 (CPL) 已被提议作为生物分子同手性的起源之一。然而,CPL 诱导的对映体过量仅非常低(<2% ee)。我们发现了前所未有的由手性物理因素直接触发的不对称自催化的例子,即右手和左手 CPL,导致接近对映体纯的化合物。通过 r-CPL 照射对外消旋嘧啶基烷醇进行不对称光解,然后进行不对称自催化,得到 (R)-嘧啶基烷醇的 ee > 99.5%。另一方面,用 l-CPL 照射可提供具有 >99.5% ee 的 (S)-嘧啶基链烷醇。因此,手性物理能力,如 CPL,与不对称自催化相结合,提供了高度对映体富集的化合物。
Amide Derivatives as Ion-Channel Ligands and Pharmaceutical Compositions and Methods of Using the Same
申请人:Kelly Michael G.
公开号:US20080300243A1
公开(公告)日:2008-12-04
Compounds are disclosed that have a formula represented by the following: The compounds may be prepared as pharmaceutical compositions, and may be used for the prevention and treatment of a variety of conditions in mammals including humans, including by way of non-limiting example, pain, inflammation, traumatic injury, and others.