Convenient synthesis of highly functionalized pyrazolines via mild, photoactivated 1,3-dipolar cycloaddition
A mild, photoactivated 1,3-dipolar cycloaddition procedure was successfully developed for the synthesis of polysubstituted pyrazolines. This procedure involved the in situ generation of the reactive nitrile imine dipoles using a hand-held UV lamp at 302 n
Wang, Yizhong,Rivera Vera, Claudia I.,Lin, Qing
p. 4155 - 4158
(2008/02/12)
Parallel synthesis of pyrazolines on soluble polymer support
An efficient and rapid parallel liquid-phase synthesis of pyrazolines has been developed. The one-pot three-components reaction of polyethylene glycol (PEG)-supported acrylate 1, aldehyde 2 and aryl hydrazine 3 in the presence of chloramine-T in methanol gave the corresponding PEG-supported pyrazolines 5. Cleavage from the support under mild conditions afforded pyrazolines 6 in good yields (69-91%) and high purities (91-100%).
Photochemie diarylsubstituierter 2H-Tetrazole; Zum Einfluss des Loesungsmittels und der Temperatur auf die Cycloadditionsgeschwindigkeitskonstanten von Diarylnitriliminen and Dipolarophilie
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Leihkauf, Peter,Lohse, Volkmar,Csongar, Christian,Tomaschewski, Georg
p. 29 - 30
(2007/10/02)
Photochemistry of Diarylsubstituted 2H-Tetrazoles. VI. Quantumyields of the Photolysis of Diarylsubstituted 2H-Tetrazoles
The photoexcitation of diarylsubstituted 2H-tetrazoles in ethanol in the presence of methylmethacrylat (MMA) yields quantitatively 1,3-diaryl-Δ2-pyrazolines.The photoreactions investigated are spectroscopically uniform.The influence of the subs
Lohse, V.,Leihkauf, P.,Csongar, Ch.,Tomaschewski, G.
p. 406 - 414
(2007/10/02)
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