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。
Complementary Iron(II)‐Catalyzed Oxidative Transformations of Allenes with Different Oxidants
作者:Venkata R. Sabbasani、Hyunjin Lee、Yuanzhi Xia、Daesung Lee
DOI:10.1002/anie.201510006
日期:2016.1.18
Substituent‐ and oxidant‐dependent transformations of allenes are described. Given the profound influence of the substituent on the reactivity of allenes, the subtle differences in allene structures are manifested in the formation of diverse products when reacted with different electrophiles/oxidants. In general, reactions of nonsilylated allenes involve an allylic cation intermediate by forming a
Tridentate P,N,N-ligand promoted copper-catalyzed [3 + 2] cycloaddition of propargylic esters with β-enamino esters: synthesis of highly functionalized pyrroles
作者:Qing Li、Chuan-Jin Hou、Yun-Ze Hui、Yan-Jun Liu、Rui-Feng Yang、Xiang-Ping Hu
DOI:10.1039/c5ra19304d
日期:——
A copper-catalyzed [3 + 2] cycloaddition of propargylicesters with β-enamino esters under mild reaction conditions for the construction of highlyfunctionalized pyrroles has been developed. By employment of a newly developed tridentate P,N,N-ligand, a variety of fully substituted pyrroles were achieved in good to high yields.
Efficient Synthesis of N-Alkylated 4-Pyridones by Copper-Catalyzed Intermolecular Asymmetric Propargylic Amination
作者:Wen Shao、Ye Wang、Ze-Peng Yang、Xiao Zhang、Shu-Li You
DOI:10.1002/asia.201800373
日期:2018.5.4
Copper‐catalyzed intermolecularasymmetricpropargylicamination with 4‐hydroxypyridines has been realized for the first time. In the presence of Cu complex derived from Pybox ligand, the N‐propargylated 4‐pyridones were obtained under mild reaction conditions with up to 99 % yield and 95 % ee. The Pybox ligand bearing a 4‐F‐phenyl substituent plays a key role for the high enantioselectivity. The products
Synthesis and Transformation of Bis(silyl)-Substituted Conjugated Vinylallene Compounds
作者:Yi-Sen Qian、Jin-Bo Zhao、Yun-He Xu
DOI:10.1021/acs.orglett.3c02738
日期:2023.10.13
bis(silyl)-substituted vinylallenes in moderate yields under mild reaction conditions. The reaction shows broad substrate scope and single stereoselectivity. Besides, we develop a method to decrease the electrocyclization temperature of vinylallenes for the synthesis of methylenecyclobutenes by installing bis(silyl) substituents. And the effect of a silyl substituent on electrocyclization of vinylallenes was studied