Regioselective Iron‐Catalysed Cross‐Coupling Reaction of Aryl Propargylic Bromides and Aryl Grignard Reagents
作者:Inés Manjón‐Mata、M. Teresa Quirós、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/adsc.201901203
日期:2020.1.7
An iron‐catalysed Kumada‐type cross‐coupling reaction between aryl substituted propargylic bromides and arylmagnesium reagents has been developed. Propargylic coupling products were the main or only outcome, and propargyl/allene regioselectivity was shown to depend on the electronic nature of the substituents on the triple bond of the substrate and on the arylmagnesium halide. Best selectivities were
1,2-Dibromotetrachloroethane: an efficient reagent for many transformations bymodified Appel reaction
作者:Selçuk EŞSİZ、Arif DAŞTAN
DOI:10.3906/kim-1804-41
日期:——
been developed for the synthesis of alkyl bromides from various alcohols under mild conditions using a triphenylphosphine (PPh$_3})$/1,2-dibromotetrachloroethane (DBTCE) complex in excellent yields and very short time (5 min). This method can also be applied for the transformation of chiral alcohols to their corresponding bromides in very high enantiomeric excess. The PPh$_3}$/DBTCE complex is also
Catalytic Cycloisomerization of Enyne Diesters Derived From 2‐Propargyloxyarylaldehydes
作者:Manoj Kumar Saini、Shashi Kant Verma、Ashok K Basak
DOI:10.1002/adsc.202200026
日期:2022.3.15
A catalytic cycloisomerization of enyne diesters derived from 2-propargyloxyarylaldehydes is described. The cycloisomerization, catalyzed by 10 mol% In(OTf)3, provides access to 2H-chromenes bearing diethyl 2-(hetero)arylidene malonates at 3-position. This enyne metathesis-type reaction is also useful for the synthesis of thia-, aza- and quinoline analogs of the 3-substituted 2H-chromenes. DDQ mediated
Synthesis and characterization of organogold complexes containing an acid stable Au–C bond through triazole-yne 5-endo-dig cyclization
作者:Yunfeng Chen、Dawei Wang、Jeffrey L. Petersen、Novruz G. Akhmedov、Xiaodong Shi
DOI:10.1039/c0cc01338b
日期:——
A new class of ionic organogold complexes were prepared through triazole-alkyne 5-endo-dig cyclization with air, moisture and acid stable AuâC bonds.