novel Rh‐catalyzed [n+1]‐type cycloadditions of 1,4‐enyne esters, which involve an acyloxy migration as a key step. The efficient preparation of functionalized resorcinols, including biaryl derivatives, from readily available 1,4‐enyne esters and CO was achieved by Rh‐catalyzed [5+1] cycloaddition accompanied by 1,2‐acyloxy migration. When enyne esters had an internal alkyne moiety, the reaction proceeded
我们开发了新颖的1,4-烯炔酯的Rh催化[ n +1]型环加成反应,其中涉及酰氧基迁移是关键步骤。通过Rh催化的[5 + 1]环加成并伴有1,2-酰氧基迁移,可以从容易获得的1,4-烯炔酯和CO中有效制备功能化间苯二酚,包括联芳基衍生物。当烯炔酯具有一个内部炔烃部分时,该反应会通过[4 + 1]型环加成反应进行,涉及1,3-酰氧基迁移,从而生成环戊烯酮。
Synthesis of functionalized resorcinols by rhodium-catalyzed [5+1] cycloaddition reaction of 3-acyloxy-1,4-enynes with CO
carbonylative cycloadditionreaction has been developed using a Rh complex as catalyst. This reaction can convert readily available 3-acyloxy-1,4-enynes and CO to a wide range of functionalized resorcinols in good yields. A mechanism involving Rh-catalyzed cyclocarbonylation of 3-acyloxy-1,4-enynes accompanied by a 1,2-acyloxy shift is proposed for the present [5+1] type cycloadditionreaction.
Silver(I)-Catalyzed Hydroazidation of Ethynyl Carbinols: Synthesis of 2-Azidoallyl Alcohols
作者:Zhenhua Liu、Jianquan Liu、Lin Zhang、Peiqiu Liao、Jinna Song、Xihe Bi
DOI:10.1002/anie.201310264
日期:2014.5.19
The hydroazidation of alkynes is the most straightforward pathway to synthetically useful vinyl azides. However, a general hydroazidation of alkynes remains elusive. Herein, a chemo‐ and regioselective transformation of ethynylcarbinols into vinyl azides is described. This reaction produces a wide variety of 2‐azidoallyl alcohols with high efficiency and in good to excellent yields. These compounds
Gold(I)-Catalyzed 1,3-Carbofunctionalizations of Anthranils with Vinyl Propargyl Esters To Yield 1,3-Dihydrobenzo[<i>c</i>]-isoxazoles
作者:Manisha Skaria、Pankaj Sharma、Rai-Shung Liu
DOI:10.1021/acs.orglett.9b00880
日期:2019.4.19
This work describes gold-catalyzed 1,3-carbofunctionalizations of anthranils with vinyl propargyl esters to form 1,3-dihydrobenzo[c]-isoxazoles. Excellent diastereoselectivity has been achieved to yield products containing three stereogenic carbons. These new catalytic reactions are operable with anthranils and vinyl propargyl esters over a wide scope, further manifesting the synthetic utility.