An unexpected synthesis of vinyl trifluoromethyl thioethers from epoxides has been described. Treatment of epoxides with AgSCF3 in the presence of n-Bu4NI and KI in toluene afforded various vinyl trifluoromethyl thioethers in moderate to good yields. The use of easily available substrates and tolerance of wide functional groups are the notable advantages of this protocol.
Quaternary Alkyl Ammonium Salt-Catalyzed Transformation of Glycidol to Glycidyl Esters by Transesterification of Methyl Esters
作者:Shinji Tanaka、Takuya Nakashima、Toshie Maeda、Manussada Ratanasak、Jun-ya Hasegawa、Yoshihiro Kon、Masanori Tamura、Kazuhiko Sato
DOI:10.1021/acscatal.7b03303
日期:2018.2.2
ring-opening reaction of the epoxide. Computational studies of the reaction mechanism indicated that the alkoxide anion derived from glycidol tends to abstract the proton of another glycidol rather than work as a nucleophile, initiating the catalytic transesterification. Payne rearrangement of the deprotonated glycidol, which produces a destabilized base that promotes nonselective reactions, is energetically
3-tert-butylamino-2-hydroxypropyl-4-butoxybenzoates were prepared as potential antagonists of the β1-adrenergic receptor (beta-blockers). A multistep synthesis of these compounds is described as well as their detailed analytical characterization. The pharmacokinetic properties of these weak base compounds are significantly influenced by their acid-base dissociation constant, pKa. The knowledge of this value is crucial