Radical-Mediated Strategies for the Functionalization of Alkenes with Diazo Compounds
作者:Yong-Liang Su、Geng-Xin Liu、Jun-Wen Liu、Linh Tram、Huang Qiu、Michael P. Doyle
DOI:10.1021/jacs.0c05183
日期:2020.8.12
reported. Here we report a novel reaction of diazo compounds utilizing a radical-mediated addition strategy to achieve difunctionalization of diverse alkenes. Diazo compounds are transformed to carbon radicals with a photocatalyst or an iron catalyst through PCET processes. The carbon radical selectively adds to diverse alkenes delivering new carbon radical species, then forms products through hydroalkylation
β‐Diazocarbonyl Compounds: Synthesis and their Rh(II)‐Catalyzed 1,3 C−H Insertions
作者:Liyin Jiang、Zhaofeng Wang、Melanie Armstrong、Marcos G. Suero
DOI:10.1002/anie.202015077
日期:2021.3.8
of ketone silyl enol ethers with diazomethyl‐substituted hypervalent iodine reagents that gives access to unusual β‐diazocarbonyl compounds. The potential of this unexplored class of diazo compounds for the development of new reactions was demonstrated by the discovery of a rare Rh‐catalyzed intramolecular 1,3 C−H carbene insertion that led to complex cyclopropanes with excellent stereocontrol.
Synthesis of 2,2,2,‐Trichloroethyl Aryl‐ and Vinyldiazoacetates by Palladium‐Catalyzed Cross‐Coupling
作者:Liangbing Fu、Jeffrey D. Mighion、Eric A. Voight、Huw M. L. Davies
DOI:10.1002/chem.201700101
日期:2017.3.8
An efficient and convenient synthesis of 2,2,2‐trichloroethyl (TCE) aryl‐ and vinyldiazoacetates was achieved by palladium‐catalyzedcross‐coupling reactions between TCE diazoacetates and aryl or vinyl iodides. The broad substrate scope allows for rapid and facile formation of TCE aryl‐ and vinyldiazoacetates, which recently have emerged as versatile reagents for rhodium‐carbene chemistry.
despite remarkable advances in metal-carbene chemistry, transition metal catalysts that are capable of enantioselective intermolecular carbene C—H insertion are mainly constrained to dirhodium(II) and iridium(III)-based complexes. Herein, we disclose a new version of asymmetric carbene C—H insertion reaction with rhodium(I) catalyst. A highly enantioselective rhodium(I) complex-catalyzed C(sp3)—H functionalization
Iridium(<scp>iii</scp>)-bis(imidazolinyl)phenyl catalysts for enantioselective C–H functionalization with ethyl diazoacetate
作者:N. Mace Weldy、A. G. Schafer、C. P. Owens、C. J. Herting、A. Varela-Alvarez、S. Chen、Z. Niemeyer、D. G. Musaev、M. S. Sigman、H. M. L. Davies、S. B. Blakey
DOI:10.1039/c6sc00190d
日期:——
the interplay of experimental and computational insights. The reaction is tolerant of a variety of diazoacetate precursors and is found to be heavily influenced by the steric and electronic properties of the substrate. Phthalan and dihydrofuran derivatives are functionalized in good yields and excellent enantioselectivities.
据报道,使用基于实验和计算见解的相互作用而开发的新型 Ir( III )-双(咪唑啉基)苯基催化剂家族,仅接受受体的金属碳烯进行分子间对映选择性 C-H 官能化。该反应能够耐受多种重氮乙酸盐前体,并且发现该反应很大程度上受到底物的空间和电子性质的影响。苯并呋喃和二氢呋喃衍生物以良好的收率和优异的对映选择性进行官能化。