Zentralwirksame 4-Phenylpyrane:Hydrierte Phenylchromene、Phenylaza- 和 Phenyloxachromene sowie Phenyl-oxa- 和 Phenyldioxanthene durch [4+2]-Cycloaddition
摘要:
Durch [4+2]-Cycloadditionsreaktion der Enamine 1a 和 1b, 7a–7d sowie 9a und 9b mit den Enonen 2a und 2b sowie 11a–11c entstehen die hydrierten und aminsubstituierten,-pyranalyerten,-pyranalyerten, Pyanalylierten, Pyranopyran-Derivate 3a–3c, 8a–8d, 10, 12, 13a 和 13b sowie 14a。Diese lassen sich durch Säureeinwirkung in die entsprechenden Phenylpyrane überführen; 3a z。B. bildet so die Tetrahydrobenzopyrancarbonsäure
New Heterocyclic Pyrano[2′,3′:5,6]Chromeno[3,2-c]Pyridin-4-Ones and Furo[2′,3′:5,6]Chromeno[3,2-c]Pyridin-3(2H)-Ones Synthesized Via a Hetero-Diels–Alder Reaction
作者:A. V. Popova、G. P. Mrug、K. M. Kondratyuk、S. P. Bondarenko、M. S. Frasinyuk
DOI:10.1007/s10600-016-1846-6
日期:2016.11
hetero-Diels–Alder reactions was studied. Isoflavones and aurones were used as examples to show that their Mannich bases reacted with 4-(1-methyl-1,2,3,6-tetrahydropyridin-4-yl)morpholine through an elimination mechanism and subsequent cycloaddition to form derivatives of the new heterocyclic systems pyrano[2′,3′:5,6]chromeno[3,2-c]pyridin-4-one and furo[2′,3′:5,6]chromeno[3,2-c]pyridin-3(2H)-one.
Synthesis of bicyclic azacompounds (3-dimethylcarbamoyloxyphenyl) substituted as acetylcholinesterase inhibitors
作者:Anna Borioni、Maria Rosaria Del Giudice、Carlo Mustazza、Franco Gatta
DOI:10.1002/jhet.5570370422
日期:2000.7
This paper describes the synthesis of some bicyclic 2-(3-dimethylcarbamoyloxyphenyl) substituted azaderivatives, obtained from 1,4- and 1,5-diketones, which were cyclized with ammonium acetate, methylamine and by reductive amination. Corresponding 3-substitutedderivatives were instead prepared by reaction of 1,5-ketoesters with formamide. The carbamates were tested as in vitro acetylcholinesterase
Reaction of , -unsaturated trifluoromethyl ketones with cyclic enamines
作者:V. G. Nenajdenko、S. V. Druzhinin、E. S. Balenkova
DOI:10.1023/b:rucb.0000030821.56661.44
日期:2004.2
The reactions of α,β-unsaturated trifluoromethyl ketones containing aromatic and heteroaromatic substituents with 1-morpholinocyclopentene, 1-morpholinocyclohexene, and 1-methyl-4-morpholino-1,2,5,6-tetrahydropyridine were studied. The reactions proceeded stereospecifically to give the corresponding bicyclo[3.2.1]octane, bicyclo[3.3.1]nonane, and azabicyclo[3.3.1]nonane derivatives.
Cycloaddition reactions of the mesoionic dehydrodithizone incorporating a new 1,3-dipolar species
作者:P. Rajagopalan、P. Penev
DOI:10.1039/c2971000490b
日期:——
The mesoionicdehydrodithizone (I) reacts readily, in 1,3-dipolar fashion, with activated alkenes and alkynes to furnish cycloadducts and with ethoxycarbonyl-methylenetriphenylphosphorane to yield the betaine (IX).
7-Phenyl[1]benzopyrano-(bzw. -thiopyrano)-pyrane aus 3-Benzyliden-chromanonen (bzw. -thiochromanonen)
作者:Fritz Eiden、Gerda Felbermeir
DOI:10.1002/ardp.19843171010
日期:——
Durch Cycloaddition der 3‐Benzyliden‐chromanone bzw. ‐thiochromanone 3a‐3f mit den Enaminen 5 sowie 10a‐10c entstanden die amin‐ und phenylsubstituierten Benzopyrano (bzw. ‐thiopyrano) [4,3‐b]dihydropyrane 6a‐6f sowie 11a‐11d. Hydrolyse und Wasserabspalten überführte 6e und 11b in die entsprechenden Pyran‐Derivate 9 und 12.