Nucleophilic difluoromethylation and difluoromethylenation of aldehydes and ketones using diethyl difluoromethylphosphonate
作者:Petr Beier、Anastasia V. Alexandrova、Mikhail Zibinsky、G.K. Surya Prakash
DOI:10.1016/j.tet.2008.10.006
日期:2008.12
New methodology for difluoromethylation and difluoromethylenation of aldehydes and ketones based on nucleophilic fluorination using diethyl difluoromethylphosphonate (1) was developed.
开发了基于使用二氟甲基膦酸二乙酯 (1) 进行亲核氟化的醛和酮的二氟甲基化和二氟甲基化的新方法。
Redox-Neutral 1,3-Diol Synthesis by Base-Promoted Diastereoselective Alcohol–Aldolization
作者:Na Shao、Jean Rodriguez、Adrien Quintard
DOI:10.1021/acs.orglett.0c02536
日期:2020.9.18
redox-neutral condensation of ketones with alcohols. This diastereoselective alcohol–aldolization enables bypassing the classical oxidation and reduction steps necessary for the preparation of this crucial backbone by an overall redox-neutral formal borrowing hydrogen process. The starting alcohols constitute both the precursors of the in situ generated reactive aldehydes and the hydride source necessary
Introducing difluoromethylene sulfonamide group via nucleophilic addition of difluoromethylene anion with aromatic aldehydes
作者:Jun-Li Li、Jin-Tao Liu
DOI:10.1016/j.tet.2006.11.036
日期:2007.1
for the introduction of difluoromethylene sulfonamide or difluoromethylene group. Under different conditions, 2 reacted readily with aromatic aldehydes to give the corresponding difluoromethylene-containing alcohols or diols in moderate to good yields in the presence of potassium tert-butoxide. Difluoromethylene sulfonamide group was introduced into organic compounds directly for the first time by this
为了引入二氟亚甲基磺酰胺或二氟亚甲基,开发了新的含氟合成子R 1 COCF 2 SO 2 R 2(2,R 1,R 2=吗啉代,哌啶子基等)。在叔丁醇钾的存在下,在不同条件下,2容易与芳族醛反应,以中等至良好的收率得到相应的含二氟亚甲基的醇或二醇。通过这种方法首次将二氟亚甲基磺酰胺基团直接引入有机化合物中。
Direct Aldol-Reduction Process using Difluoromethyl Aryl Ketones and Aryl Aldehydes in the Presence of Potassium tert-Butoxide: One-Pot Efficient Stereoselective Synthesis of Symmetrical and Unsymmetrical anti-2,2-Difluoropropane-1,3-diols
作者:Wei Xu、Maurice Médebielle、Marie-Hélène Bellance、William R. Dolbier
DOI:10.1002/adsc.201000548
日期:2010.11.2
The potassium tert-butoxide.mediated deprotonation of two difluoromethyl aryl ketones in the presence of aryl aldehydes in anhydrous dimethylformamide (DMF), provides an efficient and stereoselective synthesis of anti-2,2-difluoropropane-1,3-diols. Both symmetrical and unsymmetrical diols could be prepared in moderate to good yields from readily available starting materials.