Modified Preparation Method of Trifluoromethylated Propargylic Alcohols and Its Application to Chiral 2,6-Dideoxy-6,6,6-trifluoro sugars
摘要:
Convenient generation of 3,3,3-trifluoropropynyl anion was realized from 2-bromo-3,3,3-trifluoropropene, and the anion's reaction with various electrophiles proceeded in excellent isolated yields. One of the pro ducts, 1-(benzyloxy)-6,6,6-trifluoro-4-hexyn-3-ol (4b), was further employed for the diastereoselective construction of 2,6-dideoxy-6,6,6-trifluorosugars after enzymatic optical resolution and osmium dihydroxylation of the corresponding olefins. The strongly electron-withdrawing trifluoromethyl moiety, significantly affecting the nucleophilic nature of neighboring functionalities, allows the ready differentiation of hydroxy groups by routine chemical transformation, which results in the shortening of the reaction sequence.
3-Trifluoromethyl-2Z, 4E-dienoate () and the dienamide (,) were prepared through the Claisen rearrangement of trifluoromethylated propargylic and allylic alcohols.
A useful one-pot preparation method of allylic alcohols with fluorinated alkyl groups at the gamma position was developed from the corresponding enoates by way of the DIBAL-mediated half reduction, followed by nucleophilic attack of Grignard reagents to aldehydes equilibrating with aluminium acetals. (C) 2013 Elsevier B.V. All rights reserved.