C–H Activation Guided by Aromatic N–H Ketimines: Synthesis of Functionalized Isoquinolines Using Benzyl Azides and Alkynes
摘要:
Aromatic N-H ketimines were in situ generated from various benzylic azides by ruthenium catalysis for the subsequent Rh-catalyzed annulation reaction with alkynes to give the corresponding isoquinolines. In contrast to conventional synthetic methods for aromatic NH ketimines, our protocol works under mild and neutral conditions, which enabled the synthesis of isoquinolines having various functionalities such as carbonyl, ester, alkenyl, and ether groups. In addition, the imidates generated from alpha-azido ethers were successfully used for the synthesis of 1-alkoxyisoquinolines.
Substitution of α-azido ethers with Grignard reagents and its use in combinatorial chemistry
作者:Mukulesh Baruah、Mikael Bols
DOI:10.1039/b110428b
日期:2002.2.6
α-Azidobenzyl ethers were reacted with alkyl or arylGrignard reagents in toluene to produce α-alkylbenzyl or diarylmethyl ethers in 82â94% yield. α-Azidobenzyl ethers were also reacted with multicomponent Grignard reagents to produce libraries of α-alkylbenzyl ethers.
Lifetimes of oxocarbenium ions in aqueous solution from common ion inhibition of the solvolysis of .alpha.-azido ethers by added azide ion
作者:Tina L. Amyes、William P. Jencks
DOI:10.1021/ja00202a033
日期:1989.9
Determination des constantes de vitesse d'hydration des ionsoxocarbeniums intermediaires. Effet des substituants
Determination des constantes de vitesse d'hydration des ions oxocarbeniums intermediaires。替代物的作用
Labelled nucleotides
申请人:Liu Xiaohai
公开号:US20090062145A1
公开(公告)日:2009-03-05
The invention provides a nucleotide or nucleoside having a base attached to a detectable label via a cleavable linker, characterised in that the cleavable linker contains a moiety selected from the group comprising: Formula (I)
(wherein X is selected from the group comprising O, S, NH and NQ wherein Q is a C
1-10
substituted or unsubstituted alkyl group, Y is selected from the group comprising O, S, NH and N(allyl). T is hydrogen or a C
1-10
substituted or unsubstituted alkyl group and * indicates where the moiety is connected to the remainder of the nucleotide or nucleoside).
The invention provides a nucleotide or nucleoside having a base attached to a detectable label via a cleavable linker, characterised in that the cleavable linker contains a moiety selected from the group comprising: Formula (1) (wherein X is selected from the group comprising O, S, NH and NQ wherein Q is a C
1-10
substituted or unsubstituted alkyl group, Y is selected from the group comprising O, S, NH and N(allyl), T is hydrogen or a C
1-10
substituted or unsubstituted alkyl group and * indicates where the moiety is connected to the remainder of the nucleotide or nucleoside).
Introduction of an azido substituent at the α position of benzyl ethers can be achieved by treating them with IN3 in refluxing acetonitrile. Some of the products obtained after 20 min-5 h are given.