Yb(<scp>iii</scp>)-catalysed <i>syn</i>-thioallylation of ynamides
作者:Manash Protim Gogoi、Rajeshwer Vanjari、B. Prabagar、Shengwen Yang、Shubham Dutta、Rajendra K. Mallick、Vincent Gandon、Akhila K. Sahoo
DOI:10.1039/d1cc02611a
日期:——
incorporating a sulfide moiety at the α-position and an allyl group at the β-position of the ynamide. The transformation is successful under ytterbium(III)-catalysis, providing access to highly substituted thioamino-skipped-dienes with broad substrate scope. Thus, tetrasubstituted olefins (with four different functionalgroups: amide, phenyl, thioaryl/alkyl, and allyl on the carbon centers) are made in a single
本文报道的是一种顺式结合在α位的烯丙基在炔酰胺的β位的硫化物部分和ynamides的-thioallylation。该转化在镱 ( III ) 催化下成功,提供了获得具有广泛底物范围的高度取代的硫氨基跳过二烯的途径。因此,四取代的烯烃(在碳中心上具有四个不同的官能团:酰胺、苯基、硫代芳基/烷基和烯丙基)是由易于获得的 ynamides 一步制成的,从而保持完整的原子经济性。该反应可扩展到由炔酰胺合成selenoamino二烯的顺式-selenoallylation。DFT 研究和控制实验提供了对反应机制的深入了解。
Alkylation des ions carboxylates par les sels de sulfonium: influence des sels de cuivre
Sulfonium salts are extremely powerful alkylating agents, particularly in the two-phase technique both solid-liquid and liquid-liquid). Alkylation of carboxylate salts by sulfonium salts does not show very large dependence on ratio of reactivities of various groups attached to the sulfur and mixtures of esters are often obtained. In the presence of copper(I) salts, there is a strong acceleration of
Treatment of phosphines, phosphites, or sulfides with trialkylborane under air afforded the corresponding oxides in good yields.
在空气中用三烷基硼烷处理膦、亚磷酸酯或硫化物,以良好的产率得到相应的氧化物。
Copper catalyzed oxidation of sulfides to sulfoxides with aqueous hydrogen peroxide
作者:Subbarayan Velusamy、Akkilagunta V. Kumar、Rakesh Saini、T. Punniyamurthy
DOI:10.1016/j.tetlet.2005.03.194
日期:2005.5
Copper(II) complex 1 catalyzes the oxidation of sulfides to sulfoxides with 30% H2O2 in high yields. Addition of a catalytic amount of TEMPO to the reaction mixture enhances the conversion and selectivity. Complex 1 can be recycled without loss of activity.
铜(II)配合物1以高收率催化硫化物氧化为30%H 2 O 2的亚砜。向反应混合物中加入催化量的TEMPO可提高转化率和选择性。配合物1可以循环使用而不会损失活性。
VO2F(dmpz)2: a new catalyst for selective oxidation of organic sulfides to sulfoxides with H2O2
作者:Sahid Hussain、Dhrubajyoti Talukdar、Saitanya K. Bharadwaj、Mihir K. Chaudhuri
DOI:10.1016/j.tetlet.2012.09.067
日期:2012.11
(dmpz = 3, 5 dimethyl pyrazole) is reported as recyclable catalyst for the selective oxidation of organicsulfides with H2O2 in CH3CN at sub-ambient temperature. [VO2F(dmpz)2]–H2O2 system chemoselectively oxidizes alkyl as well as aryl sulfides in the presence of oxidation prone functional groups such as CC, –CN, and –OH. Refractory sulfides (dibenzothiophenes) are also oxidized to sulfoxides.
据报道,一种新开发并具有结构特征的钒配合物[VO 2 F(dmpz)2 ](dmpz = 3,5二甲基吡唑)是可循环利用的催化剂,用于在亚氯甲烷中用CH 3 CN中的H 2 O 2选择性氧化有机硫化物。环境温度。[VO 2 F(dmpz)2 ] –H 2 O 2系统在易氧化的官能团(例如C C,-CN和-OH)存在下,化学选择性地氧化烷基以及芳基硫化物。难熔硫化物(二苯并噻吩)也被氧化为亚砜。