The copper‐photocatalyzed borylation of aryl, heteroaryl, vinyl and alkyl halides (I and Br) was reported. The reaction proceeded using a new heteroleptic Cu complex under irradiation with blue LEDs, giving the corresponding boronic‐acid esters in good to excellent yields. The reaction was extended to continuous‐flow conditions to allow an easy scale‐up. The mechanism of the reaction was studied and
据报道,铜光催化的芳基,杂芳基,乙烯基和烷基卤化物(I和Br)的硼化反应。该反应在蓝色LED的照射下使用一种新型的杂铜配合物进行,从而得到了相应的硼酸酯,收率良好至极佳。反应扩展到连续流动条件,以易于放大。研究了该反应的机理,并提出了基于还原淬灭(Cu I / Cu I * / Cu 0)的机理。
Enantioselective C–H Arylation and Vinylation of Cyclobutyl Carboxylic Amides
Pd(II)/Pd(IV) redox catalysis. This ligand scaffold overcame two important limitations of the previous MPAHA (mono-N-protected α-amino-O-methylhydroxamic acid) ligand-enabled asymmetric C–H activation/C–C coupling reactions of cyclic carboxylic amides through Pd(II)/Pd(0) catalysis: substrates containing α-hydrogen atoms are not compatible, and vinylation has not been developed. Sequential C–H arylation
Ligand-Free Palladium-Catalyzed Carbonylative Suzuki Couplings of Vinyl Iodides with Arylboronic Acids under Substoichiometric Base Conditions
作者:Zhiyuan Yang、Pei-Xue Gong、Wei Han、Junjie Chen、Jie Zhang、Xu Gong
DOI:10.1055/a-1511-0435
日期:2021.7
A ligand-free palladium-catalyzedcarbonylation of vinyl iodides with arylboronic acids, permitting the synthesis of chalcones and α-branched enones, has been established. This reaction proceeds smoothly at ambient pressure and temperature, and works well even with a substoichiometric amount of base. Importantly, this mild, efficient, and operationally simple protocol is suitable for the late-stage
Palladium-Catalyzed Carbonylative Transformation of Organic Halides with Formic Acid as the Coupling Partner and CO Source: Synthesis of Carboxylic Acids
作者:Fu-Peng Wu、Jin-Bao Peng、Xinxin Qi、Xiao-Feng Wu
DOI:10.1021/acs.joc.7b01808
日期:2017.9.15
A palladium-catalyzedcarbonylative transformation of organic halides with formic acid as the coupling partner to produce carboxylic acids has been developed. With a catalytic amount of DCC as the activator of formic acid, the process can be realized successfully through benzoic formic anhydride as the intermediate. Both vinyl and aryl (pseudo)halides were conveniently transformed into the corresponding
Pd(II)‐Catalyzed Tandem Enantioselective Methylene C(sp
<sup>3</sup>
)−H Alkenylation–Aza‐Wacker Cyclization to Access β‐Stereogenic γ‐Lactams
作者:Yi Ding、Ye‐Qiang Han、Le‐Song Wu、Tao Zhou、Qi‐Jun Yao、Ya‐Lan Feng、Ya Li、Ke‐Xin Kong、Bing‐Feng Shi
DOI:10.1002/anie.202004504
日期:2020.8.10
describe an unprecedented cascade reaction to β‐stereogenicγ‐lactams involving Pd(II)‐catalyzedenantioselective aliphatic methyleneC(sp3)−Halkenylation–aza‐Wackercyclization through syn‐aminopalladation. Readily available 3,3′‐substituted BINOLs are used as chiral ligands, providing the corresponding γ‐lactams with broad scope and high enantioselectivities (up to 98 % ee ).