1981
DOI: 10.1021/jo00336a036
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Facile synthesis of N-acyl-2-pyrrolines

Abstract: In conjunction with our studies of the amidoalkylation reaction,' multigram quantities of N-acyl-2-pyrrolines (1) were needed. Interestingly, only a few methods for the synthesis of this class of compounds had been reported. Stille and co-workers prepared 1 by a novel transition metal mediated isomerization of Nacyl-3-pyrrolines2 and also cyclized (acy1amino)butyraldehydes to produce le3 Although these methods are excellent for qmall-scale preparation, large-scale reactions would entail considerable expense.

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Cited by 54 publications
(27 citation statements)
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“…(1RS,5SR,7RS)-N-Methoxycarbonyl-7-phenyl-6-oxa-2-azabicyclo[3.2.0]-heptane (4 a): According to the general irradiation procedure, benzaldehyde (159 mg, 152 mL, 1.50 mmol) and 2,3-dihydropyrrole 3 a [15,43] (318 mg, 2.50 mmol) were irradiated in acetonitrile (15 mL (16) [PhCO] , 82 (28) [C 5 H 8 N] , 41 (24) [C 2 H 3 N] ; elemental analysis calcd (%) for C 13 H 15 NO 3 (233.26): C 66.94,H 6.48,N 6.00;found C 66.78,H 6.68,N 5.77.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…(1RS,5SR,7RS)-N-Methoxycarbonyl-7-phenyl-6-oxa-2-azabicyclo[3.2.0]-heptane (4 a): According to the general irradiation procedure, benzaldehyde (159 mg, 152 mL, 1.50 mmol) and 2,3-dihydropyrrole 3 a [15,43] (318 mg, 2.50 mmol) were irradiated in acetonitrile (15 mL (16) [PhCO] , 82 (28) [C 5 H 8 N] , 41 (24) [C 2 H 3 N] ; elemental analysis calcd (%) for C 13 H 15 NO 3 (233.26): C 66.94,H 6.48,N 6.00;found C 66.78,H 6.68,N 5.77.…”
Section: Methodsmentioning
confidence: 99%
“…(1RS,5SR,7RS)-2-tert-Butoxycarbonyl-7-phenyl-6-oxa-2-azabicyclo[3.2.0]-heptane (4 c): According to the general irradiation procedure benzaldehyde (159 mg, 152 mL, 1.50 mmol) and dihydropyrrole 3 c [15,43] (634 mg, 3.75 mmol) were irradiated in acetonitrile (15 mL) for 4 h. The mixture was removed in vacuo and the residue was purified by flash chromatography (P/TBME 80:20). A total of 168 mg (41 %) of oxetane 4 c was obtained as a colorless oil: R f 0.36 (P/TBME 40:60); 1 3 Hz,1 H;CHPh),7.24 ± 7.37 (m,5 H;Ph); 1 H NMR (minor rotamer,500 MHz): d 1.16 (s,9 H;C(CH 3 ) 3 ), 1.73 ± 1.86 (m,1 H;CHHCH 2 N),2.16 (dd,2 J(H,H) 14.2 Hz,3 J(H,H) 6.…”
Section: Methodsmentioning
confidence: 99%
“…10,11 Esta reação de ciclodição foi desenvolvida em trabalhos anteriores, sendo até aquele momento inédita na literatura. 6 A 2-isoxazolina aza-bicíclica racêmica 4 foi obtida em excelente rendimento, de forma régio e diastereoespecífica, conforme previsto pela teoria de orbitais de fronteira.…”
Section: Parte Químicaunclassified
“…The trimer 3 is unstable in the presence of mineral acids and forms the products from aldol condensation [132,159]. For more details about the properties of the trimer 3, its isolation methods, and its purification, see [132,[159][160][161] In chemical transformations the trimer 3 acts like a latent form of aminobutyraldehyde [33,162,163]. Early methods for the synthesis of the trimer 3 involved the reaction of pyrrolidine and tetramethylenediamine with hypochlorites by a modification of the procedure in [164] and also hydrolysis by a methanol solution of 1-formyl-2-methoxypyrrolidine hydrochloride (44% a of 3 together with 16% a of aminobutanal dimethyl acetal) [165].…”
Section: -Phthalimidobutanalmentioning
confidence: 99%