Stereoselective hydrozirconation of alkynylsulfide and regioselective synthesis of haloalkenyl sulfide via electrophile-switched halogenation of thioalkenyl zirconocene
摘要:
Stereoselective preparation of alkenyl sulfide was carried out via syn-hydrozirconation of the alkynyl sulfide. Regiochemistry of halogenation of the thioalkenyl zirconocene could be switched by different halides. alpha-Chloroalkenyl sulfide or beta-haloalkenyl sulfide (Br, I) could be obtained by the treatment of NCS or NBS (NIS), respectively. Possible mechanism of halogenation of the thioalkenyl zirconocene was set up herein. (C) 2013 Elsevier Ltd. All rights reserved.
Investigations on Gold‐Catalyzed Thioalkyne Activation Toward Facile Synthesis of Ketene Dithioacetals
作者:Xiaohan Ye、Jin Wang、Shengtao Ding、Seyedmorteza Hosseyni、Lukasz Wojtas、Novruz G. Akhmedov、Xiaodong Shi
DOI:10.1002/chem.201702710
日期:2017.8.4
from a gold‐associated thioketene intermediate. Based on this interesting mechanistic insight, a gold(I)‐catalyzed thioether addition to thioalkynes was developed as a novel approach to prepare ketenedithioacetals with good yields and high efficiency.
date. Here we report for the first time the highly enantioselective C–H alkenylation of quinoline- and pyridine-substituted ferrocenes with alkynes by a half-sandwich scandium catalyst. This protocol features broad substrate scope, high enantioselectivity, and 100% atom efficiency, selectively affording a newfamily of planar-chiral ferrocenes bearing N/alkene functionalities. The mechanistic details
Ir-Catalyzed Regio- and Stereoselective Hydrosilylation of Internal Thioalkynes: A Combined Experimental and Computational Study
作者:Li-Juan Song、Shengtao Ding、Yong Wang、Xinhao Zhang、Yun-Dong Wu、Jianwei Sun
DOI:10.1021/acs.joc.6b00854
日期:2016.8.5
However, the exploitation for selectivehydrosilylation of unsymmetrical internal alkynes has been limitedly known. Described here is a new example of this type. Specifically, [(cod)IrCl]2 catalyzes the efficient and mild hydrosilylation of thioalkynes by various silanes with excellent regio- and stereoselectivity. DFT studies suggested a new mechanism involving Ir(I) hydride as the key intermediate.
Highly Regio- and Stereoselective Hydrosilylation of Internal Thioalkynes under Mild Conditions
作者:Shengtao Ding、Li-Juan Song、Yong Wang、Xinhao Zhang、Lung Wa Chung、Yun-Dong Wu、Jianwei Sun
DOI:10.1002/anie.201500372
日期:2015.5.4
A general and mildhydrosilylation of thioalkynes is described. With the cationic catalyst [Cp*Ru(MeCN)3]+ and the bulky silane (TMSO)3SiH, a range of thioalkynes underwent smooth hydrosilylation at room temperature with excellent α regioselectivity and syn stereoselectivity. DFT calculations provided important insight into the mechanism, particularly the unusual syn selectivity with the [Cp*Ru(MeCN)3]+