Tuning the Reactivity of Difluoromethyl Sulfoximines from Electrophilic to Nucleophilic: Stereoselective Nucleophilic Difluoromethylation of Aryl Ketones
作者:Xiao Shen、Wei Zhang、Chuanfa Ni、Yucheng Gu、Jinbo Hu
DOI:10.1021/ja308419a
日期:2012.10.17
A stereoselective synthesis of enantiomerically enriched difluoromethyl tertiary alcohols by tuning the reactivity of difluoromethylsulfoximinesfromelectrophilic to nucleophilic difluoromethylating agents is reported. The key feature of this chemistry is the diastereoselective addition of the difluoromethylsulfoximine to the prochiral carbon of the ketone. The present method was used to prepare
报道了通过调节二氟甲基亚砜亚胺的反应性从亲电子到亲核二氟甲基化试剂的立体选择性合成对映体富集的二氟甲基叔醇。这种化学的关键特征是二氟甲基亚砜亚胺与酮的前手性碳的非对映选择性加成。本方法用于制备对映体富集的二氟甲基仲醇和天然产物 gossonorol 和 boivinian B 的二氟化类似物,证明了该方法的效力。
Potent, Selective and Low-Calcemic Inhibitors of CYP24 Hydroxylase: 24-Sulfoximine Analogues of the Hormone 1α,25-Dihydroxyvitamin D<sub>3</sub>
作者:Mehmet Kahraman、Sandra Sinishtaj、Patrick M. Dolan、Thomas W. Kensler、Sara Peleg、Uttam Saha、Samuel S. Chuang、Galina Bernstein、Bozena Korczak、Gary H. Posner
DOI:10.1021/jm040129+
日期:2004.12.1
A dozen 24-sulfoximine analogues of the hormone 1alpha,25-dihydroxyvitamin D-3 were prepared, differing not only at the stereogenic sulfoximine stereocenter but also at the A-ring. Although these sulfoximines were not active transcriptionally and were only very weakly antiproliferative, some of them are powerful hydroxylase enzyme inhibitors. Specifically, 24-(S)-NH phenyl sulfoximine 3a is an extremely potent CYP24 inhibitor (IC50 = 7.4 nM) having low calcemic activity. In addition, this compound shows high selectivity toward the CYP24 enzyme in comparison to CYP27A1 (IC50 > 1000 nM) and CYP27B (IC50 = 554 nM).