Carbenoid entry into trifluoromethylated molecules: preparation of functionalized CF3-containing γ, δ -unsaturated carboxylic esters by rhodium-catalyzed reaction of ethyl 3,3,3-trifluoro-2-diazo-propionate with allylic sulfides and their further facile conversion to trifluoromethylated conjugated dienoic esters
作者:Guoqiang Shi、Yuanyao Xu、Ming Xu
DOI:10.1016/s0040-4020(01)96907-8
日期:1991.1
The [2,3]-sigmatropic rearrangement of sulfonium ylidesderivedfrom rhodium-catalyzed decomposition of ethyl 3,3,3-trifluoro-2-diazopropionate in the presence of allylic sulfides affords a variety of functionalized CF3-containing γ , δ-unsaturated carboxylic esters which have been further converted to synthetically useful trifluoromethylated dienoic esters via the dehydrosulfenylation sequence. For
Platinum and Gold Catalysis: à la Carte Hydroamination of Terminal Activated Allenes with Azoles
作者:José Miguel Alonso、María Paz Muñoz
DOI:10.1021/acs.orglett.9b02949
日期:2019.9.20
methodology to achieve selective addition of azoles to the proximal or distal carbon of activated allenes depending on the catalyst used, unravelling a gold–platinum bimetallic catalysis approach for the 1,3-double addition of azoles to activated allenes to give 1,3-bisazole derivatives, an important scaffold in medicinal and organometallic chemistry.
Convenient synthesis of allenyl sulphides; application to the synthesis of αβ-unsaturated ketones
作者:Richard C. Cookson、Philip J. Parsons
DOI:10.1039/c39780000822
日期:——
P2S5 in methylene chloride containing pyridine reduces allenyl phenyl sulphoxides to sulphides; the difficult hydrolysis of the latter is eased by the introduction of a methoxy group into the benzene ring and this method then becomes a practicable synthesis of αβ-unsaturatedketones.
含吡啶的二氯甲烷中的P 2 S 5将烯丙基苯基亚砜还原为硫化物;后者的水解难以通过引入甲氧基的成苯环缓和,则此方法变得α的切实可行合成β不饱和酮。
Rhodium-Catalyzed [(3+2)+2] Carbocyclization of Alkynylidenecyclopropanes with Substituted Allenes: Stereoselective Construction of Tri- and Tetrasubstituted Exocyclic Olefins
作者:P. Andrew Evans、Daniela E. Negru、Deju Shang
DOI:10.1002/anie.201410857
日期:2015.4.13
distal terminus to generate tri‐ and tetrasubstituted exocyclic olefins with a neutral rhodium catalyst. In addition, this method provides a strategy for the total synthesis of the guaiane family of sesquiterpenes, which are not directly accessible using alkynes as exogenous π‐components. Finally, the preparation of the bicyclo[5.4.0]undecane ring system using a homologated ACP tether serves to further
Cu(I)/Chiral Bisoxazoline‐Catalyzed Enantioselective Doyle‐Kirmse Reaction of Allenyl Sulfides with
<i>α</i>
‐Diazoesters
作者:Kang Wang、Shu‐Sen Li、Jianbo Wang
DOI:10.1002/chem.202200170
日期:2022.4.12
A Cu(I)/chiral bisoxazoline-catalyzed enantioselective Doyle-Kirmse reaction of polyfluoroaryl allenylsulfides with α-diazoesters, generating chiral tertiary homopropargylic sulfides in good enantioselectivities under mild conditions.