We report that aromatic propargylation is achievable with secondary propargylic fluorides, thus affording 1-alkyl-1-aryl-2-alkynes. In the present case, hydrogen bonding is responsible for the activation of the C–F bond. A large excess of arene nucleophile is shown to be necessary to achieve good yields.
An Unexpected Domino Reaction of β-Keto Sulfones with Acetylene Ketones Promoted by Base: Facile Synthesis of 3(2<i>H</i>
)-Furanones and Sulfonylbenzenes
作者:Wei Tong、Qian-Yu Li、Yan-Li Xu、Heng-Shan Wang、Yan-Yan Chen、Ying-Ming Pan
DOI:10.1002/adsc.201700830
日期:2017.11.23
An unexpected domino reaction of β‐keto sulfones with acetylene ketones has been developed. The domino reaction of β‐keto sulfones with diynones proceeded smoothly in the presence of 30 mol% K2CO3 without other additives, and afforded the novel 3(2H)‐furanone derivatives. On replacing the diynones with terminal alkyne ketones, the reaction regioselectivity was changed and sulfonylbenzenes were obtained
β-酮砜与乙炔酮发生了意想不到的多米诺反应。在没有其他添加剂的情况下,在30 mol%K 2 CO 3的存在下,β-酮砜与二炔酮的多米诺反应顺利进行,得到了新颖的3(2 H)-呋喃酮衍生物。用末端炔烃酮取代二炔酮后,反应区域选择性改变,并通过苯环化获得磺酰苯,收率很高。
Copper-Catalyzed Cascade Aminoalkynylation–Oxidation of Propargylic Alcohols: Stereospecific Synthesis of (<i>Z</i>)-2-Amino Conjugated Enynals/Enynones
Copper-catalyzed cascade aminoalkynylation–oxidation of propargylic alcohols has been realized, sterospecifically providing an array of (Z)-2-amino conjugated enynals/enynones in good yields under mild conditions. This transformation involves a rare 1,3-alkynyl migration of propargylic alcohols and simultaneously forms C–C, C–N, and C═O bonds. Furthermore, (Z)-2-amino conjugated enynals were applied