Imidazole-assisted Intramolecular Phenoxythio Carbonylation of Tertiary Alcohols A Key Reactiob for the Deoxygenation od a-Trifluoromethylarylmethyl Alcohols
作者:Fu-Lian Hsu、Xiaoyan Zhang、Seoung-Soo Hong、Frederic J. Berg、Duane D. Miller
DOI:10.3987/com-94-s(b)77
日期:——
The deoxygenation of alpha-trifluoromethylarylmethyl alcohols failed under catalytic hydrogenation conditions. However, these alcohols can be deoxygenated via their thionocarbonate intermediates followed by homolytic reductive cleavage of the C-O bond. The formation of the phenyl thionocarbonate esters is sterically dependent. Consequently, secondary alpha-trifluoromethyl arylmethyl alcohols can be smoothly converted to thionocarbonates, but tertiary alcohols cannot. Exceptions to this lack of reactivity are the aryl 4-substituted imidazolyl trifluoromethyl carbinols, which do form the thionocarbonates under these conditions.