Synthesis of chalcogenol esters from chalcogenoacetylenes
摘要:
Thiol and selenol esters were conveniently prepared in good yields by reacting chalcogenoacetylenes with trifluoroacetic acid in dichloromethane in the presence of silica. (C) 2001 Elsevier Science Ltd. Ah 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
synthesis of a vast variety of heteroatom‐containing cyclobutene‐triflones [bis(trifluoromethylsulfonyl)cyclobutenes] and cyclobutenones has been developed starting from heteroatom‐substituted alkynes and a pyridinium salt (a latent Tf2C=CH2 source). This powerful methodology, involving cyclization reactions, allows for the selective preparation of oxygen‐, nitrogen‐, bromine‐, chlorine‐, iodine‐, sulfur‐
从杂原子取代的炔烃和吡啶鎓盐(潜在的Tf 2 C = CH 2来源)开始,开发了可控制的无金属合成各种杂原子的环丁烯-triflones [双(三氟甲基磺酰基)环丁烯]和环丁烯酮。。这种强大的方法涉及环化反应,可以选择性地制备氧,氮,溴,氯,碘,硫,硒,碲,磷和硅官能化的环丁烯衍生物。
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]+