Copper-Catalyzed Cross-Nucleophile Coupling of β-Allenyl Silanes with Tertiary C–H Bonds: A Radical Approach to Branched 1,3-Dienes
作者:Qi-Chao Shan、Lu-Min Hu、Wei Qin、Xu-Hong Hu
DOI:10.1021/acs.orglett.1c02112
日期:2021.8.6
3-dienes throughoxidative coupling of two nucleophilic substrates, β-allenyl silanes, and hydrocarbons appending latent functionality by copper catalysis. Notably, C(sp3)–H dienylation proceeded in a regiospecific manner, even in the presence of competitive C–Hbonds that are capable of occurring hydrogen atom transfer process, such as those located at benzylic and other tertiary sites, or adjacent to an
Organozinc Reagents in DMSO Solvent: Remarkable Promotion of S<sub>N</sub>2′ Reaction for Allene Synthesis
作者:Koji Kobayashi、Hiroshi Naka、Andrew E. H. Wheatley、Yoshinori Kondo
DOI:10.1021/ol801249w
日期:2008.8.7
The S N2' reaction of propragyl mesylates with organozinc reagents was dramatically improved in DMSOsolvent, and the stereoselective conversion of chiral substrates was successfully achieved using LiCl-free diorganozinc without the loss of optical purity.