functionalization of sterically hindered terminal olefins is reported. Alkenes bearing quaternary carbons at the allylic or homoallylic position are readily oxidized to the corresponding aldehydes by palladium/copper/nitrite catalysis. A broad range of functional groups including esters, nitriles, silyl ethers, vinylogous esters, ketones, lactones, and β-ketoesters are tolerated under the reaction conditions
报道了一种空间位阻末端烯烃功能化的新策略。在烯丙基或同烯丙基位置带有季碳的烯烃很容易被
钯/
铜/
亚硝酸盐催化氧化成相应的醛。在反应条件下可以耐受多种官能团,包括酯、腈、甲
硅烷基醚、
乙烯基酯、酮、内酯和 β-
酮酯。粗醛产物可以进一步转化,使受阻末端烯烃直接转化为各种其他合成有用的官能团,导致正式的反马尔科夫尼科夫加
氢胺化等转化。