Transition-Metal-Free Semihydrogenation of Diarylalkynes: Highly Stereoselective Synthesis of trans-Alkenes Using Na2S·9H2O
摘要:
A highly stereoselective and efficient transition-metal-free semihydrogenation of internal alkynes to E-alkenes using cheap and green water as hydrogen donor is described. The reactions are conducted under convenient conditions and provide products in good to excellent yields, with broad substrate scope, including a variety of diarylalkynes.
Oxidant-Controlled C-sp<sup>2</sup>/sp<sup>3</sup>–H Cross-Dehydrogenative Coupling of N-Heterocycles with Benzylamines
作者:Rohit Sharma、Mohd Abdullaha、Sandip B. Bharate
DOI:10.1021/acs.joc.7b00856
日期:2017.9.15
cross-dehydrogenative coupling (CDC) of benzylamines with N-heterocycles having sp2 or sp3 carbon resulted in the formation of C-benzoylated or alkenylated products. Benzoylation of N-heterocycles occurs via (NH4)2S2O8 catalyzed benzoyl radical formation. An oxidative alkenylation of N-heterocycles having C-sp3 carbon (2-methylaza-arenes) occurs via deamination of benzylamine followed by C-sp3-H bond activation
苄基胺与具有sp 2或sp 3碳的N-杂环的氧化剂控制的离子液体介导的交叉脱氢偶联(CDC)导致C-苯甲酰化或烯基化产物的形成。N-杂环的苯甲酰化是通过(NH 4)2 S 2 O 8催化的苯甲酰基基团形成的。具有C-sp 3碳的N-杂环(2-甲基氮杂芳烃)的氧化烯基化反应是通过苄胺的脱氨基反应,然后以高立体选择性进行C-sp 3 -H键活化而进行的。苯甲酰化和烯基化方案均不含金属,绿色,简单,有效,并且可耐受多种官能团。
PYRIDINE DERIVATIVES
申请人:Novartis AG
公开号:EP0998459A2
公开(公告)日:2000-05-10
US6656957B1
申请人:——
公开号:US6656957B1
公开(公告)日:2003-12-02
[EN] PYRIDINE DERIVATIVES<br/>[FR] DERIVES DE PYRIDINE
申请人:——
公开号:WO1999002497A2
公开(公告)日:1999-01-21
[EN] Compounds of the formula (I), wherein X and R1 to R5 are as defined in the description, are useful for treating disorders mediated full or in part by mGluR5. [FR] L'invention concerne les composés représentés par la formule (I) dans laquelle X et R1 à R5 sont tels que définis dans le descriptif. Ces composés sont utiles pour traiter les troubles à médiation partielle ou complète de mGluR5.