6 with potassium hydroxide or sodiummethoxide in methanol at room temperature provides 1,2-dihydro[c]benzazepin-3-ones 9. The high product yields and the ease of the reactions under surprisingly mild conditions are particularly intriguing in view of the complex mechanistic pathway involved in the overall transformation. A mechanism based on a multistep rearrangement is proposed, involving conjugated
Isoquinolines are ubiquitous structural motifs in a variety of bioactive compounds, including medicinal agents and natural products. The development of novel strategies for the preparation of isoqu...
Copper-Catalyzed Tandem Cross-Coupling and Alkynylogous Aldol Reaction: Access to Chiral Exocyclic α-Allenols
作者:Guangyang Xu、Zhen Wang、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.1c01712
日期:2021.7.2
tandem cross-coupling/alkynylogous aldol reaction has been developed. The tetrasubstituted allenoates containing both central and axial chirality have been obtained in moderate to good yields and excellent enantio- and diastereoselectivity. Distinct from the previous use of Cu(I) salts, this protocol features the use of copper(II) salts as a catalytic precursor in this asymmetric cross-coupling reaction
已经开发了对映选择性铜催化串联交叉偶联/炔醇醛醇反应。已经以中等至良好的产率和优异的对映选择性和非对映选择性获得了同时含有中心手性和轴向手性的四取代烯丙酸酯。与之前使用的铜 (I) 盐不同, 该协议的特点是在这种不对称交叉偶联反应中使用铜 (II) 盐作为催化前体。
Lewis Acid-Catalyzed Intramolecular [3+2] Cross-Cycloaddition of Aziridine 2,2-Diesters with Conjugated Dienes for Construction of Aza-[<i>n</i>
.2.1] Skeletons
作者:Yizhou Zhan、Tao Liu、Jun Ren、Zhongwen Wang
DOI:10.1002/chem.201704695
日期:2017.12.19
Cyclosomatic: [3+2] intramolecular cross-cycloaddition (IMCC) of aziridine 2,2-diesters with conjugated dienes has been successfully developed. This is the first regiospecific IMCC of intramolecular 1,3-dipolarcycloadditions of azomethineylides with carbon=carbon double bonds, and supplies a general and efficient strategy for construction of structurally complex and diverse aza-[n.2.1] skeletons
脂环式:氮丙啶2,2-二酯与共轭二烯的[3 + 2]分子内跨环加成(IMCC)已成功开发。这是具有碳=碳双键的偶氮甲亚胺分子内1,3-偶极环加成的第一个区域特异性IMCC,为构建结构复杂和多样的aza- [ n .2.1]骨架提供了通用而有效的策略。
Synthesis of Cyclic β-Silylalkenyl Triflates via an Alkenyl Cation Intermediate
作者:Craig J. Lee、Manisha Swain、Ohyun Kwon
DOI:10.1021/acs.orglett.8b02398
日期:2018.9.7
Trimethylsilylalkyne derivatives are transformed into cyclic β-silylalkenyl triflates through cationic cyclization and subsequent trapping of the alkenyl cation by a triflate anion. β-Silylcyclohexenyl triflates and 3-trimethylsilyl-1,4-dihydronaphth-2-yl triflates are generated efficiently using this methodology. These products provide ready access to substituted cyclohexynes, exemplified by a concise