A novelseries of 5-membered heterocycle-containing phenylpropanoic acid derivatives was discovered as potent GPR120 agonists with low clearance, high oral bioavailability and in vivo antidiabetic activity in rodents.
An electron‐deficient CpE rhodium(III) complex bearing a cyclopentadienyl ligand with two ethyl ester substituents catalyzes the tandem [2+2+2] annulation–lactamization of acetanilides with two alkynoates via cleavage of adjacent two C−H bonds to give densely substituted benzo[cd]indolones. The reactions of meta‐methoxy‐substituted acetanilides with two alkynoates also provided benzo[cd]indolones via
带有环戊二烯基配体和两个乙基酯取代基的缺电子的Cp E铑(III)络合物通过两个相邻的C-H键的裂解来催化[2 + 2 + 2]对乙酰苯胺与两个炔酸的环化-内酰胺化反应取代的苯并[ cd ]吲哚酮。的反应中的元甲氧基-取代的乙酰苯胺具有两个alkynoates还提供了苯并[ CD ]吲哚酮通过相邻的C-H / C-O键的断裂。此外,3,5-二甲氧基乙酰苯胺与两种链烷酸酯反应生成脱芳族的螺环化合物。
Studies on the Base-Promoted Conversion of Conjugated Alkynyl Esters to α-Substituted α-Allenyl Esters
作者:Salvatore D. Lepore、Yuanjun He、Pamela Damisse
DOI:10.1021/jo0487754
日期:2004.12.1
variety of conjugated alkynyl esters to α-substituted conjugated allenyl esters (racemic) through the use of strong amide bases. Substantially improved yields over typical enolate formation conditions were observed with the use of 2 equiv of lithium diisopropylamide. Trapping studies indicate that the second equivalent of base likely leads to the dianion intermediate, which upon addition of methyl iodide
Rhodium-Catalyzed Three-Component Cross-Addition of Silylacetylenes, Alkynyl Esters, and Electron-Deficient Alkenes or Isocyanates
作者:Yuki Hoshino、Yu Shibata、Ken Tanaka
DOI:10.1002/anie.201204646
日期:2012.9.10
‘Rh'oad crossing: A cationic RhI/(cod)2 complex catalyzes the chemo‐, regio‐, and stereoselective title reaction with electron‐deficient alkenes leading to substituted 1,3‐dienes. The analogous three‐component cross‐addition involving isocyanates instead of alkenes has also been developed.
'Rh'oad交叉:阳离子Rh I /(cod)2络合物催化与电子不足的烯烃的化学,区域和立体选择性标题反应,从而生成取代的1,3-二烯。还开发了类似的三组分交叉加成法,其中涉及异氰酸酯而不是烯烃。
Organocatalytic
<i>trans</i>
Phosphinoboration of Internal Alkynes
作者:Russell G. Fritzemeier、Jan Nekvinda、Christopher M. Vogels、Carol Ann Rosenblum、Carla Slebodnick、Stephen A. Westcott、Webster L. Santos
DOI:10.1002/anie.202006096
日期:2020.8.17
We report the first trans phosphinoboration of internal alkynes. With an organophosphine catalyst, alkynoate esters and the phosphinoboronate Ph2P‐Bpin are efficiently converted into the corresponding trans‐α‐phosphino‐β‐boryl acrylate products in moderate to good yield with high regio‐ and Z‐selectivity. This reaction operates under mild conditions and demonstrates good atom economy, requiring only