Direct synthesis of dialkylarylvinylsilane derivatives: metathesis of dialkylaryl-iso-propenylsilane and its application to tetracyclic silacycle dye synthesis
The metathesis of dialkylarylvinylsilane, which has not been accomplished to date, is achieved using dialkylaryl-iso-propenylsilane as a substrate. In addition, we discovered that the reason why the metathesis of a ruthenium carbene complex and dialkylarylvinylsilane is difficult is the formation of a carbide complex.
COPPER CATALYZED HALOGENATON AND REACTION PRODUCTS
申请人:Wisconsin Alumni Research Foundation
公开号:US20140371480A1
公开(公告)日:2014-12-18
A Cu(I)-catalyzed 1,3-halogen migration reaction effectively recycles an activating group by transferring a halogen from an sp
2
to a benzylic carbon with good enantioselectivity and concomitant borylation of the Ar-halo bond. The resulting enantio-enriched benzyl halide can be reacted in the same vessel under a variety of conditions to form an additional carbon-heteroatom or carbon-carbon bond while maintaining high ee. The reaction can be used to efficiently prepare novel compounds and intermediates for the preparation of therapeutics and ligands for catalysis.
Formal asymmetric hydrobromination of styrenes via copper-catalyzed 1,3-halogen migration
作者:R. J. Van Hoveln、S. C. Schmid、M. Tretbar、C. T. Buttke、J. M. Schomaker
DOI:10.1039/c4sc02040e
日期:——
An enantioselective Cu(i)-catalyzed 1,3-halogen migration reaction accomplishes a formal hydrobromination by transferring a bromine activating group from a sp2 carbon to a benzylic carbon in good er and with concomitant borylation of the Ar–Br bond.
palladium-catalyzed C–Harylation of functionalized pyrazoles/triazoles/imidazoles is developed, affording a variety of axiallychiral ortho-nitro/formyl-substituted heterobiaryls with excellent enantioselectivities and good yields. The method features a deuterated P-chiral phosphorus ligand CD3-AntPhos, a broad substrate scope of functionalized heterobiaryls, mild reaction conditions, and low palladium loadings
开发了功能化吡唑/三唑/咪唑的对映选择性钯催化C-H芳基化,提供了多种轴向手性邻硝基/甲酰基取代的杂联芳基化合物,具有优异的对映选择性和良好的产率。该方法具有氘代 P-手性磷配体 CD 3 -AntPhos、功能化杂联芳基的广泛底物范围、温和的反应条件和低钯负载量。