19844-70-3Relevant academic research and scientific papers
Annulation reaction of cyclic pyridinium ylides with: In situ generated azoalkenes for the construction of spirocyclic skeletons
Quan, Bao-Xue,Yuan, Wei-Cheng,Zhang, Ming-Liang,Zhang, Xiao-Mei,Zhao, Jian-Qiang,Zhou, Ming-Qiang,Zhuo, Jun-Rui
supporting information, p. 1886 - 1891 (2020/03/23)
Two new types of cyclic pyridinium ylides were designed and further used in reactions with azoalkenes to access structurally diverse spirocyclic compounds. A range of spiropyrazoline oxindoles could be smoothly obtained in up to 99% yield via a [4 + 1] annulation process with oxindole 3-pyridinium ylides as C1 synthons. Similarly, a series of spiropyrazoline indanones could be prepared with indanone 2-pyridinium ylides as C1 synthons. This work represents the first example of cyclic pyridinium ylides as C1 synthons for the efficient construction of spirocyclic compounds.
N-Halosuccinimide/SiCl4 as general, mild and efficient systems for the α-monohalogenation of carbonyl compounds and for benzylic halogenation
Salama, Tarek A.,Novák, Zoltán
experimental part, p. 4026 - 4029 (2011/08/09)
Combinations of N-halosuccinimide and tetrachlorosilane in acetonitrile were found to be efficient systems for the selective α-monohalogenation of carbonyl compounds as well as for benzylic halogenation under mild conditions.
Synthesis of quinoxaline analogues
Chang, Meng-Yang,Lee, Tein-Wei,Hsu, Ru-Ting,Yen, Tzu-Lin
experimental part, p. 3143 - 3151 (2011/10/30)
Substituted tricyclic or tetracyclic quinoxalines, tricyclic pyridoquinoxalines and bis-quinoxalines were synthesized in high yields starting from cyclic ketones by the -bromination of cyclic ketones with N-bromosuccinimide (NBS) followed by condensation of the resulting -bromo ketones with 1,2-diaminobenzene, 3,4-diaminopyridine, or 3,3-diaminobenzidine. Georg Thieme Verlag Stuttgart New York.
Discovery and SAR of potent, orally available and brain-penetrable 5,6-dihydro-4H-3-thia-1-aza-benzo[e]azulen- and 4,5-dihydro-6-oxa-3-thia-1-aza- benzo[e]azulen derivatives as neuropeptide Y Y5 receptor antagonists
Rueeger, Heinrich,Gerspacher, Marc,Buehlmayer, Peter,Rigollier, Pascal,Yamaguchi, Yasuchika,Schmidlin, Tibur,Whitebread, Steven,Nuesslein-Hildesheim, Barbara,Nick, Hanspeter,Cricione, Leoluca
, p. 2451 - 2457 (2007/10/03)
Combination of structural elements from a potent Y5 antagonist (2) with thiazole fragments that exhibit weak Y5 affinities followed by lead optimisation led to the discovery of (5,6-dihydro-4H-3-thia-1-aza-benzo[e]azulen-2-yl)- piperidin-4-ylmethyl-amino and (4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-2- yl)-piperidin-4-ylmethyl-amino derivatives. Both classes of compounds are capable of delivering potent and selective orally and centrally bioavailable NPY Y5 receptor antagonists.
