precursors in reactions with thioethers under the catalysis of a commercially available Ru(II) complex, from which a variety of sulfimides were synthesized efficiently and mildly. If an allyl group is contained in the thioether precursor, the [2,3]-sigmatropic rearrangement of the sulfimide occurs simultaneously and the N-allyl-N-(thio)amides were obtained as the final products. Preliminary mechanistic studies
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。
Difluoroacetaldehyde
<i>N</i>
‐Triftosylhydrazone (DFHZ‐Tfs) as a Bench‐Stable Crystalline Diazo Surrogate for Diazoacetaldehyde and Difluorodiazoethane
study, we developed a bench-stable difluoroacetaldehyde N-triftosylhydrazone (DFHZ-Tfs) as an operationally safe diazo surrogate that can release in situ two low-molecular-weight diazoalkanes, diazoacetaldehyde (CHOCHN2 ) or difluorodiazoethane (CF2 HCHN2 ), in a controlled fashion under specific conditions. DFHZ-Tfs has been successfully employed in the Fe-catalyzed cyclopropanation and Doyle-Kirmse
Enabling iron catalyzed Doyle–Kirmse rearrangement reactions with in situ generated diazo compounds
作者:Katharina J. Hock、Lucas Mertens、Renè Hommelsheim、Robin Spitzner、Rene M. Koenigs
DOI:10.1039/c7cc02801f
日期:——
Slow addition of sodium nitrite allows the in situ preparation of highly explosive diazo compounds and enables their safe and scalable application in ironcatalyzed rearrangement reactions of allylic and propargylic sulfides. With catalyst loadings as low as 0.1 mol% an effective entry into α-mercapto-nitriles, α-mercapto-esters and α-trifluoromethyl-sulfides on a gram-scale is achieved.
Phosphazene-Catalyzed Regioselective Condensation of Allyl Thioethers with Aldehydes: A Rapid Approach to 1,3-Dienyl Sulfides, -Sulfoxides and -Sulfones
The phosphazene-catalyzed regioselective condensation of allyl thioethers with aldehydes is investigated. Upon treatment of allyl thioethers with P4-t-Bu, allyl thioether anions are generated and rapidly react with aromatic aldehydes, leading to 1,3-dienyl sulfides in good yields with high regioselectivity. This finding provides an alternative approach for the preparation of allyl thioether anions
研究了磷腈催化烯丙基硫醚与醛的区域选择性缩合。用 P 4 - t -Bu 处理烯丙基硫醚时,会生成烯丙基硫醚阴离子并与芳香醛快速反应,以良好的收率和高区域选择性生成 1,3-二烯基硫醚。这一发现为以区域选择性方式制备烯丙基硫醚阴离子提供了另一种方法。此外,还证明了 1,3-二烯基硫醚的化学选择性转化以提供相应的 1,3-二烯基亚砜或 1,3-二烯基砜。