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。
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.
FeCl<sub>3</sub>-catalyzed regioselective ring-opening of aryl oxirane with 4-hydroxycoumarin for the synthesis of furo[3,2-<i>c</i>]coumarins
作者:Simra Faraz、Ahmad Ali、Abu Taleb Khan
DOI:10.1039/d3ob01721d
日期:——
The regioselective ring-opening of aryl oxiranes was investigated with various 4-hydroxycoumarins in dimethyl sulfoxide in the presence of 20 mol% FeCl3 as a catalyst at 110 °C. This approach provided a short and concise synthetic route for the regioselectivesynthesis of 2-aryl-4H-furo[3,2-c] coumarin derivatives. Product formation occurred through regioselective ring-opening of the aryl oxirane at
在 110 °C 下,在 20 mol% FeCl 3作为催化剂的情况下,在二甲亚砜中研究了芳基环氧乙烷的区域选择性开环。该方法为2-芳基-4H-呋喃并[3,2- c ]香豆素衍生物的区域选择性合成提供了一条简短的合成路线。产物的形成是通过芳基环氧乙烷在受阻较少的位点进行区域选择性开环,然后进行脱水和伴随的环化而形成的。我们的方案的显着特点是: 成本效益;反应时间短;步进经济和原子经济;易于操作;基材范围广泛;区域选择性;良至优的产量;不需要干溶剂、助催化剂、配体或任何其他添加剂;惰性大气条件。