Rhodium(III)-Catalyzed Regioselective Decarboxylative Cyclization for the Synthesis of 4<i>H</i>-Furo[3,2-<i>c</i>]chromen-4-one Derivatives
作者:Dandan Zha、Hongji Li、Shiqing Li、Lei Wang
DOI:10.1002/adsc.201600974
日期:2017.2.2
This contribution describes a regioselective cyclization of hypervalent iodine reagents (HIR) with propiolic acids in the presence of a rhodium catalyst. The mild decarboxylation can tolerate a wide range of groups and generates 4H‐furo[3,2‐c]chromen‐4‐one derivatives in good isolated yields.
该贡献描述了在铑催化剂存在下用丙酸对高价碘试剂(HIR)的区域选择性环化。轻度的脱羧可以耐受广泛的基团,并以良好的分离产率生成4 H-呋喃[3,2 - c ] chromen-4-one衍生物。
FeCl<sub>3</sub>/ZnI<sub>2</sub>-Catalyzed regioselective synthesis of angularly fused furans
作者:Amrita Dey、Alakananda Hajra
DOI:10.1039/c7ob02124k
日期:——
The FeCl3/ZnI2-catalyzed synthesis of angularly fused furans by intermolecular coupling between enols and alkynes has been developed in ambient air. The methodology is successfully applicable to 4-hydroxycoumarin, 4-hydroxyquinolinone and α-tetralone affording regioselective 2-aryl furans in good yields. The control experiments suggest the possibility of a radical reaction mechanism.
Synthesis of furo[3,2-c]coumarins via I2/TBHP-mediated reaction of 4-hydroxycoumarins with terminal alkynes
作者:Xianglong Chu、Ziqiang Tang、Jiangshan Ma、Libowen He、Lei Feng、Chen Ma
DOI:10.1016/j.tet.2018.01.012
日期:2018.3
An efficient I2/TBHP-mediated process for the formation of furo[3,2-c]coumarins from readily available materials has been developed. This process for the formation of furo[3,2-c]coumarins is quite environmental friendly and atom-economical.
已经开发了一种有效的I 2 / TBHP介导的方法,用于从容易获得的材料中形成呋喃[3,2- c ]香豆素。呋喃[3,2- c ]香豆素的形成过程是非常环保的并且是原子经济的。
Atom-economical chemoselective synthesis of furocoumarins via cascade palladium catalyzed oxidative alkoxylation of 4-oxohydrocoumarins and alkenes
A novel and efficient procedure for the synthesis of furo[3,2-c]coumarins from readily available 4-oxohydrocoumarins and alkenes in the presence of a catalytic amount of Pd(CF3COO)2 has been developed.
Synthesis of Furocoumarins via Rhodium(II)-Catalysed Heterocyclisation of 3-Diazobenzopyran-2,4-(3H)-dione with Terminal Alkynes
作者:Stefano Tollari、Giovanni Palmisano、Sergio Cenini、Giancarlo Cravotto、Giovanni B. Giovenzana、Andrea Penoni
DOI:10.1055/s-2001-12765
日期:——
The rhodium (II) acetate-catalysed decomposition of 3-diazobenzopyran-2,4(3H)-dione in the presence of a terminal alkyne gave rise to a mixture of isomeric 2-substituted furo[3,2-c]coumarin and furo[2,3-b]coumarin, resulting from a formal [3+2] cycloaddition.
在末端炔存在下,乙酸铑 (II) 催化分解 3-重氮苯并吡喃-2,4(3H)-二酮,生成异构体 2-取代呋喃并[3,2-c]香豆素和呋喃的混合物[2,3-b]香豆素,由正式的[3+2]环加成反应产生。