An Efficient Generation and Selective Aldol Reaction of the Boryl Enolates of<i>N</i>,<i>N</i>-Dialkyl-2,3,3,3-tetrafluoropropanamides
作者:Manabu Kuroboshi、Takashi Ishihara
DOI:10.1246/bcsj.63.1191
日期:1990.4
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。