Gold(I)‐Catalyzed Regio‐ and Stereoselective 1,3‐Dipolar Cycloaddition Reactions of 1‐(1‐Alkynyl)cyclopropyl Oximes with Nitrones: A Modular Entry to Highly Substituted Pyrrolo[3,4‐
<i>d</i>
][1,2]oxazepines
作者:Yanqing Zhang、Junliang Zhang
DOI:10.1002/adsc.201200288
日期:2012.9.17
An efficient approach for the synthesis of highlysubstitutedpyrrolo[3,4‐d][1,2]oxazepines has been achieved by gold(I)‐catalyzed1,3‐dipolarcycloadditionreactions of 1‐(1‐alkynyl)cyclopropyloximes with nitrones in good to excellent yields as a single diastereomer. A complete chirality transfer was observed in this transformation.
通过金(I)催化的1-(1-炔基)环丙基肟的1,3-偶极环加成反应,已经获得了一种高效合成高度取代的吡咯并[3,4- d ] [1,2]氮杂ze庚烷的方法。与硝酮一起以单一非对映异构体的形式获得良好或优异的收率。在该转化中观察到了完全的手性转移。
Au(I)-Catalyzed Efficient Synthesis of Functionalized Bicyclo[3.2.0]heptanes
作者:Guotao Li、Xiaogen Huang、Liming Zhang
DOI:10.1021/ja802294t
日期:2008.6.1
An efficient Au(I)-catalyzed synthesis of highly strained and functionalized bicyclo[3.2.0]heptanes is developed. Subsequent couplings with various nucleophiles offer additional structural features/complexity. These one-pot, three-component reactions are proposed to proceed via a key 1,3-dipolar cycloaddition between a Au carbenoid-containing carbonyl ylide and ethyl vinyl ether.
Oxidative Ring Contraction of Cyclobutenes: General Approach to Cyclopropylketones including Mechanistic Insights
作者:Andreas N. Baumann、Franziska Schüppel、Michael Eisold、Andrea Kreppel、Regina de Vivie-Riedle、Dorian Didier
DOI:10.1021/acs.joc.8b00297
日期:2018.5.4
cyclopropylketones (CPKs) under atmospheric conditions is reported. Comprehensive mechanistic studies are proposed to support this novel, yet unusual, rearrangement. Insights into the mechanism ultimately led to simplification and generalization of the ring contraction of cyclobutenes using mCPBA as an oxidant. This unique and functional group tolerant transformation proceeds under mild conditions at room temperature
Highly Diastereoselective Gold- or Copper-Catalyzed Formal [4+3] Cycloaddition of 1-(1-Alkynyl) Cyclopropyl Ketones and Nitrones
作者:Yu Bai、Jie Fang、Jun Ren、Zhongwen Wang
DOI:10.1002/chem.200901133
日期:2009.9.14
Domino day: A highlydiastereoselective Cu‐ or Au‐catalyzed tandem cycloisomerization/formal [4+3] cycloaddition of 1‐(1‐alkynyl) cyclopropylketones and nitrones has been developed (see scheme) along with an efficient one‐pot, three‐component version of this reaction. This methodology provides a route to a new type of 5/7‐bicyclic heterocycle: a furan‐fused oxazepine.
Kinetic resolution of 1-(1-alkynyl)cyclopropyl ketones by gold(i)-catalyzed asymmetric [4+3]cycloaddition with nitrones: scope, mechanism and applications
作者:Yanqing Zhang、Junliang Zhang
DOI:10.1039/c2cc30309d
日期:——
Highly useful optically active 1-(1-alkynyl)cyclopropylketones can be efficiently obtained by the kinetic resolution of the easily available racemic ones under the catalysis of the chiral gold(I) species. Reaction scope and synthetic applications are also investigated.