作者:Emily R. T. Robinson、Charlene Fallan、Carmen Simal、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/c3sc50199j
日期:——
The asymmetric annulation of a range of α,β-unsaturated acyl ammonium intermediates, formed from isothiourea HBTM 2.1 and anhydrides with either 1,3-dicarbonyls, β-ketoesters or azaaryl ketones gives either functionalised esters (upon ring opening), dihydropyranones or dihydropyridones in good yields (up to 93%) and high enantioselectivity (up to 97% ee).
A novel and metal-free approach towards α-ketoamides using a TBHP/I<sub>2</sub>-promoted tandem reaction of amines with β-diketones via C–C bond cleavage
作者:Xiaobin Zhang、Min Wang、Yicheng Zhang、Lei Wang
DOI:10.1039/c2ra22116k
日期:——
A novel approach towards the synthesis of α-ketoamides using a TBHP/I2-promoted tandem reaction of amines with β-diketones via CâC bond cleavage has been developed. This one-pot reaction proceeded well under metal-free conditions and generated the corresponding products with good yields.
Bis(iodozincio)methane, which has been shown to be an efficient reagent for organic synthesis, is obtained as THF solution. The structural information about the reagent as THF solution was corrected by small angle neutron scattering and by anomalous X-ray scattering. Those scattering experiments implied that the prepared bis(iodozincio)methane exists without forming any oligomer or aggregate. A coordination
Addition of tetrahydrothiophene (THT) to THF solution of bis(iodozincio)methane modified the stability and reactivity: EXAFS analysis indicated that THF stabilizes bis(iodozincio)methane in a monomeric structure; the species reacts with acyl chlorides to give 1,3-diketones.