Palladium-catalyzed cross-coupling reaction of bis(pinacolato)diboron with vinyl triflates β-substituted by a carbonyl group: efficient synthesis of β-boryl-α,β-unsaturated carbonyl compounds and their synthetic utility
作者:Tatsuo Ishiyama、Jun Takagi、Akihiro Kamon、Norio Miyaura
DOI:10.1016/s0022-328x(03)00611-9
日期:2003.12
Cross-coupling reaction of bis(pinacolato)diboron with β-(trifluoromethanesulfonyloxy)-α,β-unsaturated carbonyl compounds was carried out in the presence of PdCl2(PPh3)2–2PPh3 (3 mol%) and KOPh in toluene or K2CO3 in dioxane for the synthesis of cyclic and acyclic β-boryl-α,β-unsaturated esters, amides, and ketones in high yields. The vinylboronates thus obtained readily participated in carboncarbon
在甲苯中存在PdCl 2(PPh 3)2 –2PPh 3(3 mol%)和KOPh的情况下,双(频哪醇)二硼与β-(三氟甲磺酰氧基)-α,β-不饱和羰基化合物的交叉偶联反应或二恶烷中的K 2 CO 3以高产率合成环状和非环状的β-硼基-α,β-不饱和酯,酰胺和酮。由此获得的乙烯基硼酸酯容易参与碳-碳键的形成,例如与乙烯基三氟甲磺酸酯的交叉偶联和向α,β-不饱和酮中加成1,4-。