作者:Tan Inoue、Teruaki Mukaiyama
DOI:10.1246/bcsj.53.174
日期:1980.1
New borylating reagents, (Bu2BOTf and 9-BBNOTf), were prepared in high yields. The triflates reacted with enolizable ketones in the presence of tertiary amines to generate selectively one of the regioisomers of vinyloxyboranes by the choice of the reagents (the dialkylboryl triflates and tertiary amines) under mild reaction conditions. Vinyloxyboranes thus generated showed remarkable reactivity toward aldehydes to give only one regioisomer of the corresponding cross-aldols in good yields. High stereoselectivity was also observed in these reactions.
新型的硼化试剂,即(Bu2BOTf 和 9-BBNOTf),在较高产率下被制备。三氟甲磺酸盐在叔胺存在下与烯醇化酮反应,通过选择合适的试剂(二烷基硼三氟甲磺酸盐和叔胺)在温和反应条件下,选择性生成其中一种区域异构体乙烯氧基硼烷。如此生成的乙烯氧基硼烷对于醛显示出显著的反应活性,以良好产率生成相应的交叉醛醇的单一区域异构体。在这些反应中也观察到了高度的立体选择性。