Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed, which accommodates a variety of allylic and ketone substrates. Although chiral ligand is necessary for the transformation, no enantioselectivity was observed. Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed
A synthesis of allylboronates via the palladium(0)-catalyzed cross-coupling reaction of bis(pinacolato)diboron with allylic acetates
作者:Tatsuo Ishiyama、Taka-aki Ahiko、Norio Miyaura
DOI:10.1016/0040-4039(96)01505-5
日期:1996.9
The cross-coupling reaction of bis(pinacolato)diboron [(Me4C2O2)BB(O2C2Me4)] with allyl acetates regio- and E-stereoselectively provided the pinacol esters of allylboronic acids in high yields. The reaction was efficiently catalyzed by Pd(dba)2 in DMSO at 50 °C.
双(频哪醇)双硼[[Me 4 C 2 O 2)BB(O 2 C 2 Me 4)]与乙酸烯丙酯的区域和E-立体选择性交联反应提供了高产率的烯丙基硼酸的频哪醇酯。在50°C下,Pd(dba)2在DMSO中有效地催化了该反应。
Palladium-Catalyzed Allylic Alkylation via Photocatalytic Nucleophile Generation
作者:Yang Shen、Zhen-Yao Dai、Cheng Zhang、Pu-Sheng Wang
DOI:10.1021/acscatal.1c01500
日期:2021.6.18
hydrogen atom transfer photocatalyst-mediated nucleophile generation and palladium-catalyzed allylicalkylation. The synthetic utility of this strategy is embodied by a concise synthesis of (±)-mesembrine. Mechanistic studies suggest that this protocol proceeds via a radical/ionic relay process, and a carbanionic species serves as a key intermediate for nucleophile attack on π-allylpalladium through a classic
Ni-Catalyzed Reductive Allylation of Unactivated Alkyl Halides with Allylic Carbonates
作者:Yijing Dai、Fan Wu、Zhenhua Zang、Hengzhi You、Hegui Gong
DOI:10.1002/chem.201102984
日期:2012.1.16
catalytic Ni species in the presence of an environmentally benign Zn reductant, delivering allylated alkanes (see scheme). This unprecedented approach allowed a variety of unactivated alkylhalides and substituted allyliccarbonates to regioselectively afford E‐alkenes in good to excellent yields.
Optimization of asymmetric hydrogenation of 3-phenyl-3-butenoic acid catalyzed by rhodium(I)-4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyldioxolane (DIOP)
作者:Keiji Yamamoto、Kiyoshi Ikeda、Leong Kwai Yin
DOI:10.1016/0022-328x(89)87295-x
日期:1989.7
homogeneous hydrogenation of 3-phenyl-3-butenoic acid (1) has extensively been examined in the presence of the rhodium(I)/4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyldioxolane (DIOP) catalyst systems. Optimization of the reaction conditions was undertaken mainly by controlling effects of added tertiary amines as well as solvent polarities on the enantio-selectivity of the product. The best asymmetric yield