A New Approach to 2,3-Dihydro-1H-1,5-Benzodiazepines from the Reaction of o-Nitrophenylazide with α,β-Unsaturated Ketones Promoted by Samarium Diiodide

o-Nitrophenylazide was reduced by SmI2 in anhydrous THF at room temperature to produce active intermediate 2 (samarium amide), "living" double-anion in situ which reacted smoothly with α，β-unsaturated ketones to afford 2,3-dihydro-1H-1,5-benzodiazepines in good yields under mild and neutral conditions.

The Existence of 2π-periodic Solutions for Duffing Equation x+g(x(t-τ))=p(t) With Delay

Many papers have been published on the existence of periodic solutions for the Duffing equation (?)+g(x)=p(t)=p(t+2π).(1) Their main assumptions imposed on g are super-linear, sub-linear and exclude the resonance cases (see Ref. [1] and Prof. T. R. Ding’s, Prof. W.G. Ge’s recent papers). Relatively speaking, there are few papers concerning the

Low-valent titanium induced reductive cyclization of nitro compounds and aliphatic ketones:facile synthesis of 3,4-dihydro-(2H) -1,2,4-benzothiadiazine-1,1-dioxides

The intermolecular reductive cyclization of o-nitrobenzene-sulfonamides with aliphatic ketones induced by TiCl4/Sm system was studied and a series of 3, 3-disubstituted-3,4-dihydro(2H)-1,2, 4-benzothiadiazine-1,1-dioxides were synthesized in moderate to high yields under mild and neutral conditions.