Et3N-promoted tandem ring-opening reaction of N-tosylaziridines with terminal alkynoates: a straightforward synthesis of functionalized enamines
作者:Ling-Guo Meng、Lei Wang
DOI:10.1039/c2cc30317e
日期:——
A tandem ring-opening reaction of N-tosylaziridines with terminal alkynoates promoted by Et3N has been described. A variety of N-tosylaziridines reacted with terminal alkynoates to give functionalized enamines in moderate to good yields under simple reaction conditions.
Cu(I)-Catalyzed Cross-Coupling Rearrangements of Terminal Alkynes with Tropylium Tetrafluoroborate: Facile Access to Barbaralyl-Substituted Allenyl Acid Esters and 7-Alkynyl Cycloheptatrienes
cycloisomerization process from the π-alkyne–Cu(I) complex to afford the copper carbene intermediate, followed by migratory insertion with the second terminal alkyne to afford the barbaralyl-substituted allenyl acid esters. In addition, we develop a mild and highly efficient Cu(I)-catalyzed cross-coupling protocol to synthesize 7-alkynyl cycloheptatrienes that has a broad functional group tolerance and is applicable
Cyclization Reaction of 2-Azido-1-(2-hydroxyphenyl)ethanones with Terminal Alkynoates Catalyzed by 4-Dimethylaminopyridine (DMAP): Synthesis of 2-Aminobenzofuran-3(2H)-one Derivatives
作者:Ling-Guo Meng、Ni-Lin Ge、Ming-Ming Yang、Lei Wang
DOI:10.1002/ejoc.201100250
日期:2011.7
An unexpected cyclization reaction of 2-azido-1-(2-hydroxyphenyl)ethanones with terminal alkynoates catalyzed by 4-dimethylaminopyridine (DMAP) was developed, and 2-aminobenzofuran-3(2H)-one derivatives were obtained in moderate to good yields under mild reaction conditions within 2 h. The scope and limitations of the cyclization reactions were also investigated.
Construction of pyrazolo[5,1-a]isoindol-8(3aH)-one derivatives via phosphine-catalyzed cyclization of electron-deficient alkynes and N-amino substituted phthalimide
作者:Qing-Fa Zhou、Fei-Fei Ge、Qing-Qing Chen、Tao Lu
DOI:10.1039/c5ra17267e
日期:——
A novel method for the synthesis of diversely functionalized pyrazolo[5,1-a]isoindol-8(3aH)-ones is developed via phosphine-catalyzed tandem Michael addition/intramolecular Morita–Baylis–Hillman reaction of electron-deficientalkynes and N-amino substituted phthalimide. This cyclization is operationally simple under metal-free reaction conditions.
通过膦催化串联迈克尔加成反应/缺电子炔烃和氮的分子内Morita-Baylis-Hillman反应,开发了一种新颖的合成功能多样的吡唑并[5,1- a ] isoindol-8(3 aH)-ones的新方法-氨基取代的邻苯二甲酰亚胺。在无金属的反应条件下,这种环化操作简单。
Stabilization of γ-lactam and lactone ring-fused norcaradienes by protonation: DFT calculations of norcaradiene and the corresponding cycloheptatriene structures
Abstract Stabilization of norcaradiene structures of γ-lactone and lactam ring-fused 7-vinylnorcaradienes 1a – 1e in their norcaradiene – cycloheptatriene valence isomerization was achieved by protonation. Induced 13 C NMR chemical shifts caused by protonation were monitored for the cyclopropane ring carbons (C1, C6 and C7) of the norcaradiene structures as indices of their stabilities. DFT calculations
摘要 γ-内酯和内酰胺环稠合的 7-乙烯基降卡二烯 1a - 1e 在其降卡二烯 - 环庚三烯价异构化中的降卡二烯结构的稳定是通过质子化实现的。监测由质子化引起的 13 C NMR 化学位移的降甲二烯结构的环丙烷环碳(C1、C6 和 C7)作为其稳定性的指标。降卡二烯、相应的环庚三烯及其质子化结构的 DFT 计算(B3LYP/6-311+G(d) 水平)支持实验结果。