Catalytic C–H Bond Alkylation of Azoles with Alkyl Halides Mediated by Nickel(II) Complexes of Phenanthridine-Based <i>N</i>^<i>N</i><sup><i>–</i></sup>^<i>N</i> Pincer Ligands
作者:Pavan Mandapati、Jason D. Braun、Baldeep K. Sidhu、Gabrielle Wilson、David E. Herbert
DOI:10.1021/acs.organomet.0c00161
日期:2020.5.26
Ni(II) complexes supported by tridentate N^N–^N diarylamido pincer-type ligands have been demonstrated to act as active catalysts in the carbon–carbon bond forming alkylation of azoles using unactivated alkyl halides. Here, we show that benzannulated phenanthridine-containing ligands can form homogeneous Ni(II) catalysts active with both benzoxazole and benzothiazole substrates. These precatalysts
三齿N ^ N – ^ N二芳基夹钳型配体支持的Ni(II)配合物在使用未活化的烷基卤化物形成唑的碳-碳键烷基化中充当活性催化剂。在这里,我们表明含苯并菲的配体可以形成均质的Ni(II)催化剂,对苯并恶唑和苯并噻唑均具有活性。这些预催化剂已在溶液和固态中得到了充分表征,包括循环伏安法。
Microbial hydroxylation of 2-cycloalkylbenoxazoles. Part II. Determination of product structures and enhancement of enantiomeric excess
The determinations of product structures obtained in the microbial hydroxylations of various 2-cycloalkyl-1, 3-benzoxazoles using Cunninghamella blakesleeana DSM 1906 and Bacillus megaterium DSM 32 are described. The initially low e.e. of 3-(benz-1, 3-oxazol-2-yl)cyclopentan-1-ol 6, 2-(benz-1, 3-oxazol-2-yl)cyclohexan-1-ol 14 and 4-(2-bent-1, 3-oxazol-2-yl)cycloheptan-1-ol 21 can be enhanced to 98% using lipase catalyzed resolution.