efficient rhodium-catalyzed β-dehydroborylation of aldehyde-derived silyl enol ethers (SEEs) with bis(pinacolato)diboron (B2pin2) is disclosed. The borylation reactions proceeded well with alkyl- and aryl-substituted SEEs, affording a wide array of valuable functionalized β-boryl silyl enolates with high efficiency and excellent stereoselectivity. Moreover, the borylated products, through versatile
公开了醛衍生的甲硅烷基烯醇醚(SEE)与双(频哪醇)二硼(B 2 pin 2 )的有效铑催化的β-脱硼氢化。硼基化反应与烷基和芳基取代的 SEE 进行得很好,提供了一系列有价值的功能化 β-硼基甲硅烷基烯醇化物,具有高效率和优异的立体选择性。此外,borylated产品,通过通用的碳-硼键的变换,被容易地转化为合成多样有用分子,包括α羟基酮,官能看到,和宝石-difunctionalized醛。
Enantioselective Rh-Catalyzed Hydroboration of Silyl Enol Ethers
chiral boron compounds. This protocol is well suitable for activated alkenes such as vinylarenes and alkenes bearing directing groups. However, the catalytic enantioselective hydroboration of O-substituted alkenes has remained unprecedented. Here we report a Rh-catalyzedenantioselective hydroboration of silyl enol ethers (SEEs) that utilizes two new chiral phosphine ligands we developed. This approach