155602-57-6Relevant academic research and scientific papers
Synthesis of 2,3-benzodiazepines and 2,3-benzodiazepin-4-ones from arynes and β-diketones
Okuma, Kentaro,Tanabe, Yukiko,Nagahora, Noriyoshi,Shioji, Kosei
, p. 1064 - 1073 (2015/09/01)
2,3-Benzodiazepines were synthesized by two-step or one-pot reactions from aryne precursors. Reaction of 2- (trimethylsilyl)aryl triflates with β-diketones in the presence of CsF gave ortho-substituted benzophenones. Treatment of benzophenones with hydrazine hydrate resulted in the formation of 2,3-benzodiazepines in moderate yields. Tofisopam, a well known anxiolytic, could be synthesized via C-C bond insertion of 3,4-dimethoxybenzyne with 2-ethyl-1-(3,4-dimethoxyphenyl)butane-1,3-dione, followed by the reaction with hydrazine hydrate in one-pot operation. 2,3-Benzodiazepin-4-ones were also synthesized by the reaction of β-keto esters with triflates in the presence of CsF, followed by the addition of hydrazine hydrate. Substituted isoquinolines were synthesized by the reaction of ortho-substituted benzophenones with ammonium hydroxide.
A novel and convenient strategy for the synthesis of phthalazines from an aryne precursor
Bel Abed, Hassen,Bande, Omprakash,Mammoliti, Oscar,Van Lommen, Guy,Herdewijn, Piet
supporting information, p. 7056 - 7058 (2013/12/04)
A novel three-step entry toward phthalazine derivatives has been elaborated. A strategy based on a sequential acyl-alkylation/diazo transfer reaction/Diaza-Wittig reaction led to the desired analogues in moderate to good yields from an aryne precursor. Various aryl groups were introduced on the annulated pyridazine, moreover the presence of an ester group allows further modifications.
Synthesis of 3-oxo-2,3-dihydroisoquinolines from ethyl 2-acylphenylacetates and formamides
Venkov,Ivanov
, p. 1145 - 1150 (2007/10/02)
1- and 1,3-substituted 3-oxo-2,3-dihydroisoquinolines 4 are obtained from ethyl 2-acylphenylacetates 3 and formamides.
