Free Radical Pathway Cleavage of C—O Bonds for the Synthesis of Alkylboron Compounds
作者:Xi Lu、Zhen‐Qi Zhang、Lu Yu、Ben Zhang、Bing Wang、Tian‐Jun Gong、Chang‐Lin Tian、Bin Xiao、Yao Fu
DOI:10.1002/cjoc.201800500
日期:2019.1
polarized alkyl tosylate C—O bonds to the fairly limited number of C—O bonds able to participate in free radical cleavagepathways. The mechanistic studies suggested that in situ‐generated silver(0) catalytic species were the active catalytic species and played a key role in the radical pathwaycleavage of C—O bonds.
Cobalt-Catalyzed Silylcarbonylation of Unactivated Secondary Alkyl Tosylates at Low Pressure
作者:Joan E. Roque Peña、Erik J. Alexanian
DOI:10.1021/acs.orglett.7b02117
日期:2017.9.1
catalytic preparation of silyl enol ethers from unactivated secondary alkyl tosylates is reported. An inexpensive cobalt catalyst is used under mild conditions with low pressures of carbonmonoxide. Nucleophilic, anionic cobaltcarbonyls facilitate the catalytic activation of a range of alkyl tosylates. The silylcarbonylation offers a practical approach to synthetically valuable silyl enol ethers from simple
Copper-Catalyzed Cross-Coupling of Nonactivated Secondary Alkyl Halides and Tosylates with Secondary Alkyl Grignard Reagents
作者:Chu-Ting Yang、Zhen-Qi Zhang、Jun Liang、Jing-Hui Liu、Xiao-Yu Lu、Huan-Huan Chen、Lei Liu
DOI:10.1021/ja304848n
日期:2012.7.11
Practical catalytic cross-coupling of secondary alkyl electrophiles with secondary alkyl nucleophiles under Cu catalysis has been realized. The use of TMEDA and LiOMe is critical for the success of the reaction. This cross-coupling reaction occurs via an S(N)2 mechanism with inversion of configuration and therefore provides a general approach for the stereocontrolled formation of C-C bonds between
已经实现了在铜催化下仲烷基亲电试剂与仲烷基亲核试剂的实际催化交叉偶联。TMEDA 和 LiOMe 的使用对于反应的成功至关重要。这种交叉偶联反应通过构型反转的 S(N)2 机制发生,因此为手性仲醇的两个叔碳之间立体控制形成 CC 键提供了通用方法。
Ni-Catalyzed Reductive Carbonylation of Alkyl Halides to Form Dialkyl Ketones Using Diphenyl Oxalate as CO Surrogate
作者:Yuren Sun、Lei Su、Ken Yao、Hegui Gong、Weiqi Tong
DOI:10.1055/a-1550-7935
日期:2021.10
In this work, we disclosed that diphenyl oxalate serves as a CO surrogate to enable a Ni-catalyzed carbonylation of alkyl bromides/tosylates to afford dialkylketones. The reaction shows broad substrate scope and good functional group tolerance.
在这项工作中,我们公开了草酸二苯酯作为 CO 替代物,使 Ni 催化的烷基溴化物/甲苯磺酸盐羰基化得到二烷基酮。该反应显示出广泛的底物范围和良好的官能团耐受性。
Boron-promoted reductive deoxygenation coupling reaction of sulfonyl chlorides for the C(sp3)-S bond construction
Herein, we report a borane-promoted reductive deoxygenation coupling reaction to synthesize sulfides. This reaction features excellent functional group compatibility, high efficiency, broad substrate scope, and application in late-stage functionalization of biomolecules. Preliminary mechanistic studies suggest diaryl sulfides are the intermediates of this reaction. Moreover, the real active aryl sulfide
在此,我们报告了一种硼烷促进的还原脱氧偶联反应来合成硫化物。该反应具有官能团相容性好、效率高、底物适用范围广等特点,可应用于生物分子的后期官能化。初步机理研究表明二芳基硫化物是该反应的中间体。此外,真正的活性芳基硫阴离子可以在B 2 pin 2的帮助下原位生成,并通过协同的S N 2 途径与烷基甲苯磺酸盐反应。