Successive treatment of N,N-dialkyl-2,3,3,3-tetrafluoropropanamide with dibutylboryl triflate at 0°C and with ethyldiisopropylamine at −10°C resulted in clean formation of the boryl enolate of the amide, which readily reacted with various aldehydes to give the corresponding 2-fluoro-3-hydroxy-2-trifluoromethylalkanamides with high threo-selectivity and in good yields.
在0°C下用
二丁基硼酰
三氟甲磺酸酯处理N,N-二烷基-2,3,3,3-四
氟丙酰胺,在-10°C下用乙基
二异丙基胺处理,可得到酰胺的
硼酰烯醇盐,该物质很容易与各种醛反应,生成相应的2-
氟-3-羟基-2-三
氟甲基烷酰胺,具有高立体选择性,且收率较高。