Manganese-Catalyzed Stereospecific Hydroxymethylation of Alkyl Tosylates
作者:Hannah Shenouda、Erik J. Alexanian
DOI:10.1021/acs.orglett.9b03706
日期:2019.11.15
The development of a stereospecific hydroxymethylation of alkyl tosylates using an inexpensive, first-row catalyst is described. The transformation proceeds under mild conditions with low pressure to deliver homologated alcohols as products. Chiral, nonracemic β-branched primary alcohols are obtained with high enantiospecificity from easily accessed secondary alkyl substrates. Simple modification of
Cobalt-Catalyzed Carbonylative Cross-Coupling of Alkyl Tosylates and Dienes: Stereospecific Synthesis of Dienones at Low Pressure
作者:Brendon T. Sargent、Erik J. Alexanian
DOI:10.1021/jacs.7b07983
日期:2017.9.13
carbonylative coupling of alkyl tosylates and dienes producing enantioenriched dienones. This catalytic process proceeds under low pressure and mild conditions using a simple cobalt catalyst and extends to diverse tosylate and diene coupling partners. The transformation constitutes a unique, convergent approach to the asymmetric synthesis of valuable carbonyl compounds from easily accessed starting materials
Stereocontrolled C(sp<sup>3</sup>)–P bond formation with non-activated alkyl halides and tosylates
作者:Chu-Ting Yang、Jun Han、Jun Liu、Yi Li、Fan Zhang、Mei Gu、Sheng Hu、Xiaolin Wang
DOI:10.1039/c7ra02766d
日期:——
The C(sp3)–P bond is formed via the reaction between P–H compounds and non-activated alkyl electrophiles, especially secondary alkylhalides and tosylates. This reaction proceeds via an SN2 mechanism with inversion of configuration, so it can be used to form C–P bonds with stereocontrol from chiral secondary alcohols.
C(sp 3)-P键是通过P–H化合物与未活化的烷基亲电试剂(特别是仲烷基卤化物和甲苯磺酸酯)之间的反应形成的。该反应通过具有反转构型的S N 2机理进行,因此可以用于从手性仲醇的立体控制下形成C-P键。
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.
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。