Empirical information on the acidity of the propargylic proton from our previous work allowed us to develop novel synthetic transformations of readily available terminally trifluoromethylated propargylic alcohols 1 into the corresponding allenyl tosylates 3a, 1-tosyloxy- or 1-acyloxy-4,4,4-trifluorobutan-2-ones 4, and 2-(2,2,2-trifluoroethyl)prop-2-en-1-ones 5, which was enabled by such common bases
Divergent preparation of allenyl tosylates and α-tosyloxy ketones by facile and efficient isomerization of CF3-containing propargylic tosylates
作者:Yohsuke Watanabe、Takashi Yamazaki
DOI:10.1016/j.jfluchem.2010.01.003
日期:2010.5
Treatment of trifluoromethylated propargylic tosylates with hydroxides in a water-organic biphasic solvent system efficiently led to isomerization to allenyl tosylates or hydration to α-tosyloxy ketones at room temperature, just by selection of appropriate reaction conditions.