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 Hydrocarbonylative Spirolactonization for Expedite Construction of Oxaspirolactones
作者:Ketema Alemayehu Asserese、Hanmin Huang
DOI:10.1021/acs.orglett.3c00019
日期:2023.2.24
novel palladium-catalyzedcascade hydrocarbonylation of the alkene moiety followed by intramolecular spirolactonization of 2-vinylaryl hydroxyalkyl ketones has been developed, which offers efficient and expedited access to furnishing oxaspirolactones in high yields with high chemoselectivities. This new method is compatible with an array of functional groups and proceeds under mild reaction conditions
<i>N</i>‐Heterocycle‐Editing to Access Fused‐BN‐Heterocycles via Ring‐Opening/C−H Borylation/Reductive C−B Bond Formation
作者:Xu Zhang、Wanlan Su、Huosheng Guo、Pengyuan Fang、Kai Yang、Qiuling Song
DOI:10.1002/anie.202318613
日期:2024.3.4
An N-heterocyclic editing reaction through the tandem BBr3-induced ring-opening of tertiarycyclicamine, intramolecular C−H borylation, and Ni-catalyzed intramolecular B−Br/C−Br reductive coupling was developed. This method represents a simple route to construct the fused-BN-heterocycles.
通过串联 BBr 3诱导的叔环胺开环、分子内 C−H 硼基化和 Ni 催化的分子内 B−Br/C−Br 还原偶联,开发了N杂环编辑反应。该方法代表了构建稠合氮化硼杂环的简单途径。
Development of N-Heterocyclic Carbene–Copper Complexes for 1,3-Halogen Migration
作者:Steven C. Schmid、Ryan Van Hoveln、Jared W. Rigoli、Jennifer M. Schomaker
DOI:10.1021/acs.organomet.5b00629
日期:2015.8.24
A series of NHC-copper complexes was synthesized and their potential to catalyze 1,3-halogen migration explored. Increasing the steric bulk around the metal drastically improves the lifetime of NHC-CuH species and promotes 1,3-halogen migration of both 2-bromo- and 2-chlorostyrenes through transfer of an aryl halogen to a benzylic carbon with concomitant arene borylation. The NHC-based system displays a broad substrate scope with notable advantages over previously reported phosphine-based catalysts, including complete selectivity for migration versus competing benzylic borylation, increased steric tolerance, efficient aryl chloride migration, and facile formation and characterization of organocopper catalytic intermediates. Experimental evidence and DFT calculations support a mechanism proceeding through dearomatization of a benzyl copper species, followed by a 1,4-halogen shift and borylation of the resulting ArCu(I) intermediate.