Ketones and aryl or vinyl halides couple to give divinyl or arylvinyl amines in the presence of the titanium isocyanate complex [3THF·Mg2Cl2O·TiNCO]1 and a palladium catalyst, via transmetallation of the titano imine complex 6 with aryl or vinyl palladium bromide (THF tetrahydrofuran).
A new method for the synthesis of difluoromethyl enol ethers by O-difluoromethylation of 1,3-diones with ClCF<sub>2</sub>CO<sub>2</sub>Et
作者:Xiaoxi Lin、Zhiqiang Weng
DOI:10.1039/c5ob00020c
日期:——
single-step protocol for the synthesis of difluoromethyl enol ether derivatives by O-difluoromethylation of 1,3-diones via in situ generation of difluorocarbene from ClCF2CO2Et has been developed. The functional group tolerance, scalability of the reaction, and mild reaction conditions make it an attractive protocol for the synthesis of biologically relevant difluoromethyl ethers of interest to the pharmaceutical
Chiral Brønsted Acid-Promoted Enantioselective Desymmetrization in an Intramolecular Schmidt Reaction of Symmetric Azido 1,3-Hexanediones: Asymmetric Synthesis of Azaquaternary Pyrroloazepine Skeletons
The enantioselectivedesymmetrization of 2‐substituted‐2‐azidopropyl 1,3‐hexanediones through an asymmetric intramolecular Schmidt reaction using a chiral Brønsted acid has been developed for the first time. Synthetically interesting pyrroloazepine skeletons with an azaquaternary stereogenic center with up to 59 % ee are accessed effectively (see scheme; R=H, alkyl, or aryl).
首次开发了使用手性布朗斯台德酸通过不对称分子内Schmidt反应对2-取代2-叠氮丙基1,3-己二酮进行对映选择性脱对称。合成有趣的吡咯并ze庚因骨架,其氮杂季铵立体异构中心的ee高达59%(请参阅方案; R = H,烷基或芳基)。
Organocatalytic enantioselective desymmetrization of enal-tethered cyclohexane-1,3-diones
作者:Lakshmi Revati Magham、Abdus Samad、Satish B. Thopate、Jagadeesh Babu Nanubolu、Rambabu Chegondi
DOI:10.1039/d4cc00487f
日期:2024.4.2
Organocatalytic asymmetric desymmetrization of prochiral cyclohexane-1,3-diones has been demonstrated through the merging of iminium and enamine activation. The tandem annulation reaction proceeds through a sequential oxa-Michael addition/intramolecular aldol reaction/[1,3]-amino oxetane rearrangement pathway. Mechanistic study using an 18O-water experiment suggests oxetane rearrangement instead of
O-Arylation versus C-Arylation: Copper-Catalyzed Intramolecular Coupling of Aryl Bromides with 1,3-Dicarbonyls
作者:Yewen Fang、Chaozhong Li
DOI:10.1021/jo060747t
日期:2006.8.1
The copper-catalyzed intramolecular coupling of aryl bromides with 1,3-dicarbonyls via a six-membered ring closure was examined. With CuI (10 mol %) as the catalyst, N,N'-dimethylethylenediamine as the ligand, and Cs2CO3 as the base, the reactions of alpha-(2-bromobenzyl)-beta-keto esters in THF at refluxing temperature afforded the corresponding substituted 4H-1-benzopyrans in high yields via O-arylation. On the other hand, the reactions of delta-(2-bromophenyl)-beta-keto esters in refluxing dioxane led to the formation of 3,4-dihydronaphthalen-2(1H)-one derivatives via C-arylation.