(Poly)cationic λ<sup>3</sup>
-Iodane-Mediated Oxidative Ring Expansion of Secondary Alcohols
作者:Jennifer C. Walters、Anthony F. Tierno、Aimee H. Dubin、Sarah E. Wengryniuk
DOI:10.1002/ejoc.201800118
日期:2018.3.29
methodology for late-stage naturalproduct derivatization was also demonstrated, providing a new tool for diversity-oriented synthesis and complexity-to-diversity (CTD) efforts. Preliminary mechanistic investigations reveal a strong effect of alcohol conformation on reactive pathway, thus providing a predictive power in the application of this approach to complex molecule synthesis.
在此,我们报告了一种通过仲醇与(聚)阳离子λ3-碘(N-HVI)的亲电活化合成中环醚的简化方法。通过新型 2-OMe-吡啶连接的 N-HVI 的独特反应性,在已建立的 α-消除途径上实现了 CO 键迁移的优异水平选择性。所得的 HFIP-缩醛很容易用一系列亲核试剂衍生化,为后续操作提供了多功能的功能手柄。还证明了这种方法在后期天然产物衍生化中的实用性,为面向多样性的合成和复杂性到多样性(CTD)工作提供了新工具。初步的机理研究揭示了醇构象对反应途径的强烈影响,从而为该方法应用于复杂分子合成提供了预测能力。
Manganese-Catalyzed Electrochemical Deconstructive Chlorination of Cycloalkanols via Alkoxy Radicals
作者:Benjamin D. W. Allen、Mishra Deepak Hareram、Alex C. Seastram、Tom McBride、Thomas Wirth、Duncan L. Browne、Louis C. Morrill
DOI:10.1021/acs.orglett.9b03652
日期:2019.11.15
A manganese-catalyzedelectrochemicaldeconstructivechlorination of cycloalkanols has been developed. This electrochemical method provides access to alkoxyradicals from alcohols and exhibits a broad substrate scope, with various cyclopropanols and cyclobutanols converted into synthetically useful β- and γ-chlorinated ketones (40 examples). Furthermore, the combination of recirculating flow electrochemistry
A Novel Route to Geminal Dibromocyclobutanes: Syntheses of 2-Substituted Cyclobutanone Acetals and Their Reaction with Boron Tribromide
作者:Tore Nordvik、Udo H. Brinker
DOI:10.1021/jo035295o
日期:2003.11.1
Nine 2-substituted cyclobutanone acetals, in addition to the parent cyclobutanone acetal, were synthesized from their corresponding cyclobutanones and subsequently treated with boron tribromide. The substituents were either alkyl chains or a phenyl and a benzyl group, respectively. The major compounds obtained in these reactions were, in most cases, the geminal dibromocyclobutanes which were obtained
1-bromo-1-ethoxycyclopropane: a new reagent for cyclobutanone synthesis
作者:Robert C. Gadwood
DOI:10.1016/s0040-4039(01)81702-0
日期:1984.1
A variety of of cyclobutanones have been prepared in high yield from 1-bromo-1-ethoxycyclopropane via lithiation, addition to aldehydes or ketones, and mild acid-catalyzedrearrangement of the adducts.
Synthesis of 2‐Substituted Cyclobutanones by a Suzuki Reaction and Dephosphorylation Sequence
作者:Jakub Koudelka、Tomáš Tobrman
DOI:10.1002/ejoc.202100464
日期:2021.6.14
A methodology for the preparation of 2-substituted cyclobutanones from 2-substituted cyclobutenyl diethyl phosphates is described. Substrates containing electron-donating groups prefer the formation of 2-substituted cyclobutanones, while electron-withdrawing groups facilitate the opening of the cyclobutanone ring. The synthesis of cyclobutenyl sulfides is an additional advantage of this method.