DBU‐Mediated Synthesis of Aryl Acetylenes or 1‐Bromoethynylarenes from Aldehydes
作者:Yadagiri Thummala、Galla V. Karunakar、Venkata Ramana Doddi
DOI:10.1002/adsc.201801334
日期:2019.2
sequential manner for the synthesis of arylacetylenes and 1,3‐enynes starting directly from commercially available aldehydes. The bicyclic amidine 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) along with additive NaOH not only exclusively afforded the terminal alkynes directly from the aldehydes, but also enhanced the reaction rate. The dynamic nature of DBU also facilitated the isolation of 1‐bromoalkynes intermediate
[EN] NOVEL TRICYCLIC AZEPINE DERIVATIVES, METHOD FOR PRODUCTION THEROF AND PHARMACEUTICAL COMPOSITIONS COMPRISING THE SAME<br/>[FR] DERIVES D'AZEPINES TRICYCLIQUES, LEUR PROCEDE DE PREPARATION ET LES COMPOSITIONS PHARMACEUTIQUES QUI LES CONTIENNENT
申请人:SERVIER LAB
公开号:WO2004069843A1
公开(公告)日:2004-08-19
Composé de formule (I) : dans laquelle (a) représente un groupement benzo ou pyrido, éventuellement fusionné en position ( 2-3, 3-4, ou 4-5), et éventuellement substitué, (W) représente un groupement ( X-Y ou Y-X) avec (X) représentant un groupement (b), et Y représentant un atome d'oxygène ou un groupement (N-R3), n représente zéro ou un entier tel que (1 ≤ n ≤ 6 (G, R1, R2 et R3) sont tels que définis dans la description, leurs énantiomères, diastéréoisomères, ainsi que leurs sels d'addition à un acide ou à une base pharmaceutiquement acceptable. Médicaments.
The dual role of the bicyclic amidine base 1,8-diazabicydo[5.4.0]undec-7-ene (DBU) was demonstrated in a synthesis of terminal aryl- and styryl-acetylenes. Mechanistically, a tandem process involving elimination/Umpolung/protonation occurs in a single step to generate terminal aryland styryl-acetylenes from geminal dibromoalkenes. The key to the success of this transformation lies in the organobase-mediated generation of the acetylide from the 1-bromoalkynes at room temperature. The unique characteristics of DBU as an inherently safer reagent make it an attractive alternative to previous systems wherein required pyrophoric reagents and nonambient temperatures remain unsolved issues. The procedure does not work for the synthesis of alkyl-acetylenes.
DERIVES D AZEPINES TRICYCLIQUES, LEUR PROCEDE DE PREPARATION ET LES COMPOSITIONS PHARMACEUTIQUES QUI LES CONTIENNENT
申请人:Les Laboratoires Servier
公开号:EP1590355A1
公开(公告)日:2005-11-02
One‐Pot Tandem Coupling Method for the Short‐Step Formal Synthesis of Riccardin C
作者:Miho Kobatake、Norikazu Miyoshi、Masaharu Ueno
DOI:10.1002/chem.202203805
日期:2023.3.16
A formal totalsynthesis of riccardin C was achieved by a sequential five-steps four-component one-pot tandem coupling method. By optimizing each step, four individual units were connected by two Sonogashira coupling reactions and one Suzuki coupling reaction, followed by diimide reduction and acid deprotection.
通过连续五步四组分一锅串联偶联法实现了 riccardin C 的正式全合成。通过优化每个步骤,四个单独的单元通过两个 Sonogashira 偶联反应和一个 Suzuki 偶联反应连接,然后进行二酰亚胺还原和酸脱保护。