Concise Synthesis of Guanidine-Containing Heterocycles Using the Biginelli Reaction
摘要:
Two general methods for the synthesis of 2-imino-5-carboxy-3,4-dihydropyrimidines were developed using the three-component Biginelli reaction. The first method utilizes pyrazole carboxamidine, a beta-ketoester, and an aldehyde in an initial Biginelli reaction. After Boc protection, these products undergo aminolysis and acidic deprotection to generate 2-imino-5-carboxy-3,4-dihydropyrimidines in a four-step sequence. The second method utilizes a triazone-protected guanidine, a beta-ketoester, and an aldehyde in a Biginelli reaction. Acidic cleavage of the triazone yields 2-imino-5-carboxy-3,4-dihydropyrimidines in a two-step sequence. We also describe the further elaboration of several of these products using a tethered Biginelli reaction to give triazaacenaphthalene structures similar to those found in crambescidin and batzelladine alkaloids.
Concise Synthesis of Guanidine-Containing Heterocycles Using the Biginelli Reaction
摘要:
Two general methods for the synthesis of 2-imino-5-carboxy-3,4-dihydropyrimidines were developed using the three-component Biginelli reaction. The first method utilizes pyrazole carboxamidine, a beta-ketoester, and an aldehyde in an initial Biginelli reaction. After Boc protection, these products undergo aminolysis and acidic deprotection to generate 2-imino-5-carboxy-3,4-dihydropyrimidines in a four-step sequence. The second method utilizes a triazone-protected guanidine, a beta-ketoester, and an aldehyde in a Biginelli reaction. Acidic cleavage of the triazone yields 2-imino-5-carboxy-3,4-dihydropyrimidines in a two-step sequence. We also describe the further elaboration of several of these products using a tethered Biginelli reaction to give triazaacenaphthalene structures similar to those found in crambescidin and batzelladine alkaloids.
A Mild and General One-Pot Synthesis of Densely Functionalized Diaryliodonium Salts
作者:Linlin Qin、Bao Hu、Kiel D. Neumann、Ethan J. Linstad、Katelyenn McCauley、Jordan Veness、Jayson J. Kempinger、Stephen G. DiMagno
DOI:10.1002/ejoc.201500986
日期:2015.9
Diaryliodoniumsalts are powerful and widely used arylating agents in organic chemistry. Here we report a scalable, synthesis of densely functionalized diaryliodoniumsaltsfrom aryl iodides under mild conditions. This two-step, one-pot process has remarkable functional group tolerance, is compatible with commonly employed acid-labile protective group strategies, avoids heavy metal and transition metal
二芳基碘鎓盐是有机化学中强大且广泛使用的芳基化剂。在这里,我们报告了在温和条件下从芳基碘化物大规模合成密集官能化二芳基碘鎓盐的方法。这种两步一锅法具有显着的官能团耐受性,与常用的酸不稳定保护基策略兼容,避免重金属和过渡金属试剂,并为 PET 成像剂的稳定前体提供了直接途径。
[EN] COMPOUND TARGETING NOREPINEPHRINE TRANSPORTER<br/>[FR] COMPOSÉ CIBLANT UN TRANSPORTEUR DE NORÉPINÉPHRINE
申请人:UNIV WUERZBURG J MAXIMILIANS
公开号:WO2020148154A1
公开(公告)日:2020-07-23
The invention concerns a compound according to following formula, wherein R1 is an F or an I residue.