Visible photocatalysis of novel oxime phosphonates: synthesis of β-aminophosphonates
作者:Yong-Hong Li、Chun-Hai Wang、Su-Qian Gao、Feng-Ming Qi、Shang-Dong Yang
DOI:10.1039/c9cc06075h
日期:——
A novel type of oxime phosphonate was synthesized and used in the intermolecular cascade radical addition reaction of alkenes to access β-aminophosphonates via visible-light-driven N-centered iminyl radical-mediated and redox-neutral selective C–P single-bond cleavage in an active phosphorus radical route. The procedure is characterized by its ability to achieve the construction of Csp3–P and Csp3–N
Broad Scope Extra-Annular [4 + 2] Cycloaddition of <i>o</i>
-Carboryne with Styrenes: Efficient Route to Carborane-Fused Polycyclics
作者:Jie Zhang、Zuowei Xie
DOI:10.1002/cjoc.201800355
日期:2018.11
o‐Carboryne (1,2‐dehydro‐o‐carborane) generated in situ from the precursor 1‐OTf‐2‐Li‐o‐1,2‐C2B10H10 undergoes an efficient extra‐annular [4 + 2] cycloaddition with styrenes at room temperature to give a series of carborane‐fused polycyclics in good to high isolated yields. This reaction is compatible with many functional groups and has a very broad substrate scope. Further transformations of the resultant
Palladium-catalysed direct cross-coupling of secondary alkyllithium reagents
作者:Carlos Vila、Massimo Giannerini、Valentín Hornillos、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1039/c3sc53047g
日期:——
Palladium-catalysed cross-coupling of secondary C(sp3) organometallic reagents has been a long-standing challenge in organic synthesis, due to the problems associated with undesired isomerisation or the formation of reduction products. Based on our recently developed catalytic C–C bond formation with organolithium reagents, herein we present a Pd-catalysed cross-coupling of secondary alkyllithium reagents with aryl and alkenyl bromides. The reaction proceeds at room temperature and on short timescales with high selectivity and yields. This methodology is also applicable to hindered aryl bromides, which are a major challenge in the field of metal catalysed cross-coupling reactions.
Regioselective Simmons–Smith-type cyclopropanations of polyalkenes enabled by transition metal catalysis
作者:Jacob Werth、Christopher Uyeda
DOI:10.1039/c7sc04861k
日期:——
A cobalt catalyst imparts a high degree of regioselectivity in the reductive cyclopropanation of polyalkenes.
一种钴催化剂在多烯的还原环丙烷化反应中赋予高度的位置选择性。
Nickel-Catalyzed Silaboration of Small-Ring Vinylcycloalkanes: Regio- and Stereoselective (<i>E</i>)-Allylsilane Formation via C−C Bond Cleavage
作者:Michinori Suginome、Takanori Matsuda、Takayo Yoshimoto、Yoshihiko Ito
DOI:10.1021/om020007k
日期:2002.4.1
Vinylcyclopropanes and vinylcyclobutanes undergo regio- and stereoselective reaction with silylborane in the presence of nickel catalysts, giving (ω-borylalkyl)-substituted (E)-allylsilanes via cleavage of the carbon−carbonσ-bond in the rings.