On the properties of the anions derived from α-deprotonation of α-(o-carboran-1-yl)- and α-ferrocenyl-1-alkylbenzotriazoles
作者:S. K. Moiseev、M. A. Cherevatskaya、T. A. Verbitskaya、I. V. Glukhov、A. S. Peregudov、V. N. Kalinin
DOI:10.1007/s11172-012-0268-2
日期:2012.10
by reactions of the generated carbanions with MeI give the corresponding α-methylated products. Even at room temperature, they exist in solution as an equilibrium mixture of two conformers due to steric crowding around the Cα atom. In contrast, the anions generated by deprotonation of α-ferrocenyl derivatives of 1-methyl- and 1-ethylbenzotriazoles are ambident and are attacked by electrophiles at both
Abstract A practical method for N-methylation of NH-containing heterocycles using an environmentally safe and less toxic methylatingreagent, dimethylcarbonate, has been developed. N,N,N′,N′-tetramethylethylenediamine (TMEDA), an extremely active organocatalyst for the methylation of imides, indoles, benzimidazoles, and piperazines in conjunction with dimethylcarbonate, can lead to N-methylation
Borinic Acid Catalyzed Regioselective <i>N</i>-Alkylation of Azoles
作者:Shrey P. Desai、Matthew T. Zambri、Mark S. Taylor
DOI:10.1021/acs.joc.2c00281
日期:2022.4.15
described. In the presence of diphenylborinic acid (Ph2BOH) and an amine cocatalyst, heterocyclic nucleophiles such as 1,2,3- and 1,2,4-triazoles, substitutedtetrazoles, and purine are activated toward selective N-functionalization. The scope of electrophilic partners includes enones, 2-vinylpyridine, phenyl vinyl sulfone, a dehydroalanine derivative, and epoxides. Mechanistic studies, including in situ
描述了一种用烯烃或环氧化物亲电子试剂对周围的唑型杂环进行区域选择性N-烷基化的方法。在二苯基硼酸 (Ph 2 BOH) 和胺助催化剂的存在下,杂环亲核试剂如 1,2,3-和 1,2,4-三唑、取代的四唑和嘌呤被活化为选择性N官能化。亲电子伙伴的范围包括烯酮、2-乙烯基吡啶、苯基乙烯基砜、脱氢丙氨酸衍生物和环氧化物。讨论了机理研究,包括原位11 B NMR 光谱和动力学分析。
Macrocyclic metal complexes and their use for the production of conjugates with biomolecules
申请人:Platzek Johannes
公开号:US20070009442A1
公开(公告)日:2007-01-11
The invention relates to macrocyclic metal complexes and their production and use for the production of conjugates with biomolecules. The conjugates are suitable as contrast media in NMR diagnosis and radiodiagnosis as well as for radiotherapy. High relaxivity is achieved by a special liganding of macrocyclic compounds, and a fine-tuning of the relaxivity is made possible.