Kinetic Resolution of Secondary Alcohols Catalyzed at the Exterior of Chiral Coordinated Capsules
作者:Kentaro Harada、Ryo Sekiya、Takeharu Haino
DOI:10.1002/chem.202304244
日期:2024.2.21
The confinement of the chiral space inside a molecular host is an ideal platform for enantioselective reactions. However, this concept significantly limits the scope of reactants because reactants must be trapped inside molecular hosts. Instead, we utilized the exteriors of chiral molecular capsules as chiral sources and realized the kineticresolution of secondary alcohols.
作者:Vinter-Pasquier, Karine、Jamart-Gregoire, Brigitte、Caubere, Paul
DOI:——
日期:——
<b>PQXdpap</b>: Helical Poly(quinoxaline-2,3-diyl)s Bearing 4-(Dipropylamino)pyridin-3-yl Pendants as Chirality-Switchable Nucleophilic Catalysts for the Kinetic Resolution of Secondary Alcohols
Helically chiral poly(quinoxaline-2,3-diyl)s bearing 4-(dipropylamino)pyridin-3-yl pendants at the 5-position of the quinoxaline ring (PQXdpap) exhibited high catalytic activities and moderate to high selectivities (up to s = 87) in the acylative kinetic resolution of secondary alcohols. The solvent-dependent helical chirality switching of PQXdpap between pure toluene and a 1:1 mixture of toluene and
Axial chirality in biaryl
<i>N</i>
,
<i>N</i>
‐dialkylaminopyridine derivatives bearing an internal carboxy group
作者:Reiko Nishino、Shohei Hamada、Elghareeb E. Elboray、Yoshihiro Ueda、Takeo Kawabata、Takumi Furuta
DOI:10.1002/chir.23207
日期:2020.5
Axial chirality in N,N‐dimethylaminopyridines as well as N,N‐dipropylaminopyridines bearing an internal carboxy group were evaluated based on their racemization barriers and circular dichroism spectra. The half‐life of racemization of N,N‐dipropylaminopyridine derivative 2 was estimated to be 19.7 days at 20°C. Its enantiomers isolated as optically active forms showed positive‐negative and negative‐positive