BPh<sub>3</sub>-Catalyzed [2+3] Cycloaddition of Ph<sub>3</sub>PCCO with Aldonitrones: Access to 5-Isoxazolidinones with Exocyclic Phosphonium Ylide Moieties
作者:Amandeep Brar、Daniel K. Unruh、Natalie Ling、Clemens Krempner
DOI:10.1021/acs.orglett.9b02192
日期:2019.8.16
exocyclic phosphonium ylide functionalities via [2+3] cycloaddition of Ph3PCCO and aldonitrones has been developed and applied in the synthesis of 4-alkylidene-5-isoxazolidinones viaWittig olefination. The reaction proceeds by BPh3 catalysis under mild conditions and with a broad substrate scope. A reaction pathway involving the activation of the aldonitrone via interactions with the Lewis acid BPh3 is
[EN] SUBSTITUTED IMIDAZO RING SYSTEMS AND METHODS<br/>[FR] SYSTEMES CYCLIQUES IMIDAZO SUBSTITUES, ET PROCEDES CORRESPONDANTS
申请人:3M INNOVATIVE PROPERTIES CO
公开号:WO2006009832A1
公开(公告)日:2006-01-26
Imidazo ring systems, which include, for example, imidazopyridine, imidazoquinoline, 6,7,8,9-tetrahydroimidazoquinoline, imidazonaphthyridine, and 6,7,8,9-tetrahydroimidazonaphthyridine compounds substituted at the 1-position and/or the 2-position, pharmaceutical compositions containing these compounds, methods of making these compounds, and methods of use of these compounds as immunomodulators, for inducing cytokine biosynthesis in animals and in the treatment of diseases including viral and neoplastic diseases are disclosed.
Synthesis and X-ray study of hexahydro- and tetrahydrophospholo-[2,3-<i>d</i>]isoxazoles, a new class of heterocycles of potential fungicidal activity
作者:Fabrizio Machetti、Beatrice Anichini、Stefano Cicchi、Alberto Brandi、Wanda Wieczorek、K. Michal Pietrusiewicz、Jean-Claude Gehret
DOI:10.1002/jhet.5570330416
日期:1996.7
Hexahydro-, 5b-1 and 6a,f,1 and tetrahydrophospholo[2,3-d]isoxazoles 8, 9 and 10 were synthesized by 1,3-dipolar cycloaddition of nitrones 3b-1 and benzonitrile oxide (4) to 2,3-dihydro-1-phenyl-1H-phosphole 1-oxide (1) and 2,3-dihydro-1-ethoxy-1H-phosphole 1-oxide (2). The structural assignment to the compounds was confirmed by an X-ray study of two compounds of the series 5a and 5m. The compounds
通过将1,3-偶极环3b-1和氧化苄腈(4)进行1,3-偶极环加成反应合成六氢,5b-1和6a,f,1和四氢磷[2,3- d ]异恶唑8、9和10。 3-二氢-1-苯基-1 H-磷酰基1-氧化物(1)和2,3-二氢-1-乙氧基-1 H-磷酰基1-氧化物(2)。通过对5a和5m系列的两种化合物的X射线研究证实了这些化合物的结构归属。该化合物作为杀真菌剂对葡萄小单胞菌表现出良好的活性。葡萄藤上和苹果上的灰葡萄孢菌。化合物5a-d显示出弱至中等的除草剂活性。
Acid-Catalyzed 1,3-Dipolar Cycloaddition of 2<i>H</i>-Azirines with Nitrones: An Unexpected Access to 1,2,4,5-Tetrasubstituted Imidazoles
作者:Anikó Angyal、András Demjén、János Wölfling、László G. Puskás、Iván Kanizsai
DOI:10.1021/acs.joc.9b03288
日期:2020.3.6
The first 1,3-dipolarcycloaddition of 2H-azirines with nitrones, a straightforward approach toward the regioselective synthesis of 1,2,4,5-tetrasubstituted imidazoles, is reported. This trifluoroacetic acid-catalyzed protocol tolerates a broad range of aliphatic and aromatic substrates, offering an efficient access to highly diverse, multisubstituted imidazoles in isolated yields up to 83% under mild
4-Dimethylaminopyridine-Mediated [3+3] Cycloaddition of Aza-oxyallyl Cations and Nitrones
作者:Qianfa Jia、Dongli Li、Ming Lang、Kun Zhang、Jian Wang
DOI:10.1002/adsc.201700415
日期:2017.11.10
A new 4‐dimethylaminopyridine (DMAP)‐mediated [3+3] cycloaddition reaction of in situ‐ generated aza‐oxyallylcations with nitrones is reported. This simple and efficient method delivers a series of new motifs in good to excellent yields under mild conditions.