Rapid and Solvent-Free Synthesis of Homoallyl or Homopropargyl Alcohols Mediated by Zinc Powder
作者:Jin-xian Wang、Xuefeng Jia、Tuanjie Meng、Li Xin
DOI:10.1055/s-2005-872178
日期:——
A rapid and efficient procedure for the solvent-free synthesis of homoallylic and homopropargyl alcohols has been achieved by zinc-mediated Barbier-type reaction of carbonyl compounds at room temperature.
室温下,锌介导的Barbier型反应实现了醛酮化合物无溶剂合成同烯丙醇和同炔丙醇的高效快速方法。
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
Synthesis of Cyclobutanones<i>via</i>Gold-Catalyzed Oxidative Rearrangement of Homopropargylic Ethers
作者:Mei Xu、Tian-Tian Ren、Kai-Bing Wang、Chuan-Ying Li
DOI:10.1002/adsc.201300227
日期:2013.9.16
of a gold catalyst and 8‐ethylquinoline N‐oxide, a homopropargylic ether bearing an electron‐rich aromatic ring or an alkenyl group can be converted into a cis‐cyclobutanone smoothly. An α‐oxo gold carbenoid is proved to be the key intermediate, and it can evolve into an oxonium ylide.
Efficient method for propargylation of aldehydes promoted by allenylboron compounds under microwave irradiation
作者:Jucleiton J R Freitas、Queila P S B Freitas、Silvia R C P Andrade、Juliano C R Freitas、Roberta A Oliveira、Paulo H Menezes
DOI:10.3762/bjoc.16.19
日期:——
The propargylation of aldehydes promoted by microwaveirradiation using allenylboron compounds in a chemo- and regioselective way is described. The corresponding products were obtained in short reaction time, high yield and purity without the need of any solvent when allenylboronic acid pinacol ester was used, or using a minimal amount of acetone when potassium allenyltrifluoroborate was used.