Synthesis of 4-azacyclopent-2-enones and 5,5-dialkyl-4-azacyclopent-2-enones
摘要:
Three different methods are reported for the preparation of 4-azacyclo-2-enones 1, two of which allow the preparation of the compounds in optically active form. In addition, a facile route to 4-aza-5,5-dimethyleyclopent-2-enones 2 is disclosed. (C) 2004 Elsevier Ltd. All rights reserved.
A Simple Zinc-Mediated Method for Selenium Addition to Michael Acceptors
作者:Francesca Giulia Nacca、Bonifacio Monti、Eder João Lenardão、Paul Evans、Claudio Santi
DOI:10.3390/molecules25092018
日期:——
biphasic Zn/HCl-based reducing system. Alkenes with a variety of electron-withdrawing groups were investigated in order to gauge the scope and limitations of the process. Results demonstrated that the addition to acyclic α,β-unsaturated ketones, aldehydes, esters amides, and acids was effectively achieved and that alkyl substituents at the reactive β-centre can be accommodated. Similarly, cyclic enones
The synthesis of a series of 4-aza cross-conjugated cyclopentenones, inspired by the natural prostaglandin Δ12,14-15-deoxy-PGJ2 (5) is described. Using the 4-aza cyclopentenone 7, the installation of the α-side chain was performed using N-functionalisation, following a Boc-deprotection. The ω-side chain was then installed through a Baylis-Hillman type aldol reaction with trans-2-octenal. This afforded
[EN] CYCLOPENTANONE AND CYCLOPENTANONE DERIVATIVES AS POTENT ACTIVATORS OF HSF-1<br/>[FR] AMELIORATIONS RELATIVES A DES COMPOSES PHARMACEUTIQUEMENT UTILES
申请人:CHARTERHOUSE THERAPEUTICS LTD
公开号:WO2004013077A3
公开(公告)日:2004-04-22
Asymmetric Synthesis of the Carbocyclic Nucleoside Building Block (<i>R</i>)-(+)-4-Aminocyclopentenone Using δ-Amino β-Ketophosphonates and Ring-Closing Metathesis (RCM)
作者:Franklin A. Davis、Yongzhong Wu
DOI:10.1021/ol049795v
日期:2004.4.1
Amino keto-2,7-dienes undergo ring-closing metathesis (RCM) to give 4-aminocyclopentenones, valuable intermediates in the asymmetric construction of carbocyclic nucleosides. The key amino ketodienes were prepared using delta-amino beta-ketophophonates, a new sulfinimine-derived chiral building block, and HWE chemistry.
Titanium mediated alkylidenation of substituted cycloalkenones: scope and limitations
作者:Jérôme Dauvergne、Alan M Happe、Stanley M Roberts
DOI:10.1016/j.tet.2004.01.059
日期:2004.3
The conversion of the cyclopent-2-enone 5 and cyclohex-2-enones 11a, c-e into corresponding alpha'-exo-alkylidene compounds using Ti(IV) catalysis, with PPh3 and an aldehyde, is described. (C) 2004 Elsevier Ltd. All rights reserved.