105-25-9Relevant academic research and scientific papers
One-pot synthesis of 1-butylpyrrolidine and its derivatives from aqueous ammonia and 1,4-butandiol over CuNiPd/ZSM-5 catalysts
Long, Yan,Liu, Shimin,Ma, Xiangyuan,Lu, Liujin,He, Yude,Deng, Youquan
supporting information, p. 16708 - 16712 (2020/10/27)
The synthesis of 1-butylpyrrolidine and its derivatives (1-butylpyrrolidine with a little of 1-butenylpyrrolidines) was developed via a one-pot method from ammonia and 1,4-butandiol. Here, the product of 1-butylpyrrolidine was emphatically investigated, and the yield was 76% under the optimized conditions. Such a route was realized through successive N-alkylation using aqueous ammonia as the nitrogen source over the CuNiPd/ZSM-5 catalyst, which was prepared by a simple incipient wetness method. In this route, 1,4-butandiol not only participated in the formation of the N-heterocycle, but also acted as an alkylating reagent. This work offers a straightforward, economical route for 1-butylpyrrolidine and its derivatives. This journal is
ENAMINE CHEMISTRY-XXV REDUCTION OF ENAMINONONES BY LiAlH4 AND NaBH4 SYNTHESIS OF α,β-UNSATURATED ALDEHYDES
Carlsson, S.,Lawesson, S.-O.
, p. 413 - 417 (2007/10/02)
Cyclohexanone, 2-methyl-cyclohexanone and 4-methyl-cyclohexanone, 1, were transformed into the enaminones 4a-4e by the following two routes: (A): Acylation of the enamines, 2, derived from 1 and secondary amines (pyrrolidine, morpholine and piperidine) by ethyl chloroformate, and (B): Condensation of 1 with diethyl oxalate, giving the β-ketoesters 3, followed by reaction with the secondary amines.Ethyl 2(-1-pyrrolidinyl)-1-cyclopentene-1-carboxylate. 4f, and methyl 3-(1-pyrrolidinyl)-2-buteonate, 4g, were prepared from ethyl 2-oxo-1-cyclopentanecarboxylate and ethyl 3-oxo-butanoate, respectively, by condensation with pyrrolidine.Reduction of 4a by LAH afforded 1-cyclohexen-1-carboxaldehyde, 5a, 1-cyclohexene-1-methanol, 6a, and 1-(1-cyclohexene-1-methyl)pyrrolidine, 7a, in yields depending on the molar ratio of LAH/4a.Reduction of 4f by LAH gave cyclopenten-1-methanol, 6b, 1-(1-cyclopentene-1-methyl)pyrrolidine, 7b, and ethyl-2(1-pyrrolidinyl)-1-cyclopentanecarboxylate, 8b.Compound 4g, when reduced with LAH, yielded methyl 3-(1-pyrrolidinyl) butanoate, 8c (main product) and 1-(2-butenyl)pyrrolidine, 7c (minor).Reduction of 4 by NaBH4 afforded exlusively the saturated β-aminoesters, 8, in high yields.The reductions with LAH and NaBH4 are rationalized in terms of the HSAB principle.
