Acid-promoted Cascade Cyclization to Produce Fused-polycyclic Indole Derivatives
摘要:
An acid-promoted novel cascade cyclization is described. Using 8 equiv of trifluoroacetic acid or a catalytic amount of Lewis acid as the promoter, structurally diverse polycyclic cyclopenta[b]indoles were obtained in moderate to excellent yield. This cascade process was extremely effective for the synthesis of 8-membered ring-fused cyclopenta[b]indole derivatives.
One-pot synthesis of functionalized p-terphenyl derivatives
摘要:
A one-pot synthetic route for preparing functionalized p-terphenyl derivatives 1 and 4 is developed. The route is easily carried from the treatment of cinnamyl aldehydes 2 with substituted allylsulfones 3 in good yields via the tandem intermolecular aldol condensation/intramolecular electrocyclization/oxidative dehydrogenation. (C) 2013 Elsevier Ltd. All rights reserved.
One-Pot Synthesis of Substituted Tetrahydrocyclobuta[<i>a</i>]naphthalenes by Domino Aldol Condensation/Olefin Migration/Electrocyclization
作者:Meng-Yang Chang、Ming-Hao Wu、Yeh-Long Chen
DOI:10.1021/ol401152w
日期:2013.6.7
A facile one-pot syntheticroute for preparing the novel benzofused tricyclic skeleton of 1,2,2a,8b-tetrahydrocyclobuta[a]naphthalenes 5 is developed. The route was realized by a NaH-mediated tandem aldol condensation/olefin migration/electrocyclization of o-allylbenzaldehydes 1 with cinnamyl sulfones 3 in good yields.
开发了一种容易的一锅合成路线,以制备新型的1,2,2a,8b-四氢环丁[ a ]萘5苯并稠合的三环骨架。该途径是通过NaH介导的串联羟醛缩合/烯烃迁移/邻烯丙基甲醛1与肉桂基砜3的电环化以高收率实现的。
Electroreductive Cobalt‐Catalyzed Carboxylation: Cross‐Electrophile Electrocoupling with Atmospheric CO
<sub>2</sub>
作者:Nate W. J. Ang、João C. A. Oliveira、Lutz Ackermann
DOI:10.1002/anie.202003218
日期:2020.7.27
nontoxic C1 synthon is of utmost topical interest in the context of carbon capture and utilization (CCU). We present the merger of cobalt catalysis and electrochemical synthesis for mild catalytic carboxylations of allylic chlorides with CO2. Styrylacetic acid derivatives were obtained with moderate to good yields and good functional group tolerance. The thus‐obtained products are useful as versatile synthons