One-Pot, Regioselective Synthesis of Homopropargyl Alcohols using Propargyl Bromide and Carbonyl Compound by the Mg-mediated Reaction under Solvent-free Conditions
in organic synthesis is the most important goal in “Green” chemistry. We report a simple, efficient and facile method for the addition of progargyl bromide to carbonyl compounds using Mg metal as a mediator undersolvent-freeconditions which could regioselectively generate homopropargyl alcohols efficiently in good to excellent yields. The procedure has advantages such as short reaction time, operationally
Barbier-type propargylation of carbonyl compounds with propargyl bromide has been achieved with reactive zinc–copper couple under solvent-free conditions. The reaction of aldehydes with propargyl bromide produced the unique homopropargyl alcohols in excellent yields at room temperature without the formation of homoallenyl alcohols. The ketones reacted with propargyl bromide to give the corresponding homopropargyl
synthesized in high yields by the chemical reduction of the blue–black stannous oxide using freshly prepared sodium stannite solution as reducing agent at 40 °C and 60 °C. The Sn(0) particles are characterized using powder XRD, SEM, and DSC. The as-synthesized Sn(0) particles are applied as reagent for the regioselective synthesis of homopropargyl alcohols from propargyl bromide and aldehydes in distilled water
在 40 °C 和 60 °C 下,使用新鲜制备的亚锡酸钠溶液作为还原剂,通过化学还原蓝黑色氧化亚锡,以高产率合成活性 Sn(0) 颗粒。使用粉末 XRD、SEM 和 DSC 对 Sn(0) 颗粒进行表征。合成的 Sn(0) 颗粒用作试剂,用于在室温下在蒸馏水中由炔丙基溴和醛类区域选择性合成高炔丙基醇(产率 50%–84%)。该反应不需要热、微波、超声波、有机助溶剂、助试剂或惰性气氛的帮助。与其他亲电性较低的羰基官能团(如酮、酰胺和羧酸)相比,炔丙基化反应对醛具有高度化学选择性。
Furo- and Thieno [3,2-c] Pyridines
申请人:Li An-Hu
公开号:US20090197864A1
公开(公告)日:2009-08-06
Furo[3,2-c]Pyridine and Thieno[3,2-c]pyridine compounds of Formula I, and pharmaceutically acceptable salts thereof, preparation, intermediates, pharmaceutical compositions, and use, such as in disease treatment, including cancers, including conditions in which EMT is involved, including conditions mediated by protein kinase activity such as RON and/or MET.
Revisiting the Addition of in-situ Nucleophiles to Allenic Ketones: An Entry Towards Synthesis of Benzodioxins
作者:Sushree Ranjan Sahoo、Debayan Sarkar
DOI:10.1002/ejoc.202000076
日期:2020.3.22
A revisit towards regioselective addition of in situ generated negative nucleophiles to allenicketones in the presence of a base. A direct ring annulation towards the benzodioxin skeleton synthesis has been developed. In the process, the obtained E‐vinyl kenones were readily transformed into sulfones and 2,5‐disubstituted oxazole.