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Volumn , Issue 11, 2009, Pages 1812-1816

Single-step symmetrical double alkylation of β,γ-unsaturated δ-lactams via magnesium 'ate' complexes

Author keywords

Alkylation; Lactams; Magnesium 'ate' complex; Piperidines

Indexed keywords

2 PIPERIDONE DERIVATIVE; 3,6 DIHYDRO 2H PYRIDIN 2 ONE; ELECTROPHILE; HALIDE; LACTAM DERIVATIVE; LITHIUM; LITHIUM TRIBUTYLMAGNESIATE; MAGNESIUM CHLORIDE; MAGNESIUM DERIVATIVE; ORGANOLITHIUM COMPOUND; PYRIDINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 67649986214     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0029-1217354     Document Type: Article
Times cited : (17)

References (73)
  • 50
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    • Fuji, K. Chem. Rev. 1993, 115, 2037.
    • (1993) Chem. Rev , vol.115 , pp. 2037
    • Fuji, K.1
  • 67
    • 67649945585 scopus 로고    scopus 로고
    • Typical Procedure for the Dialkylation of 3 Using [Bu3Mg]Li (1a) To a cooled (0°C) and stirred solution of BuMgCl (2.1 mmol, 1.05 mL, 2.0 M in THF) in dry THF (2 mL) in a Schlenk flask, n-BuLi (4.2 mmol, 1.68 mL, 2.5 M in hexane) was added via syringe over 1 min under argon. A yellow suspension formed was stirred for 5 min and was next transferred via syringe to a cooled (0°C) solution of 6-allyl-1-methyl-3,6-dihydro-1H-pyridin-2- ones (3a, 0.3 g, 2.0 mmol) in THF (10 mL, The resulting yellow solution was stirred for 30 min at 0°C, and then benzyl bromide (0.75 g, 4.4 mmol) was added and stirred for 30 min. After addition of aq sat. NH4Cl (5 mL, the aqueous layer was extracted with EtOAc (2 × 50 mL) and the combined organic layers were dried over MgSO4. Filtration, concentration in vacuo, and purification by flash column chromatography (silica gel, n-hexane-EtOAc, 8:2, next 7:3) yielded 9a
    • 4. Filtration, concentration in vacuo, and purification by flash column chromatography (silica gel, n-hexane-EtOAc = 8:2, next 7:3) yielded 9a.
  • 68
    • 67649976351 scopus 로고    scopus 로고
    • 2, see: Rauhut, C. B.; Vu, A. V.; Fleming, F. F.; Knochel, P. Org. Lett. 2008, 10, 1187; and references cited therein, see also ref. 23a.
    • 2, see: Rauhut, C. B.; Vu, A. V.; Fleming, F. F.; Knochel, P. Org. Lett. 2008, 10, 1187; and references cited therein, see also ref. 23a.
  • 71
    • 67649905082 scopus 로고    scopus 로고
    • Selected Spectroscopic Data 6-Allyl-3,3-dibenzyl-1-methyl-3,6-dihydro- 1H-pyridin-2-one (9a) Colorless solid (0.62 g, 94, mp 61-63°C (from n-hexane, IR (KBr pellet, v, 3028 (w, 2912 (w, 1628 (s, 1496 (w, 1456 (w, 1398 (w, 1348 (w, 1230 (w, 916 (w, 756 (m, 744 (m, 702 (m, 696 (m) cm-1. 1H NMR (400.1 MHz, CDCl3, δ, 1.03 (1 H, dt, J, 14.0, 8.3 Hz, 6-CHH, 1.86 (1 H, dm, J, 14.0 Hz, 6-CHH, 2.65 (2 H, d, J, 12.6 Hz, 2 × 3-CHH, 2.69 (3 H, s, NCH3, 3.14-3.20 (1 H, m, CH-6, 3.44 (1 H, d, J, 12.6 Hz, 3-CHH, 3.47 (1 H, d, J, 12.6 Hz, 3-CHH, 4.70-4.80 (2 H, m, CH2, 4.92-5.05 (1 H, m, CH, 5.42 (1 H, dd, J, 10.3, 3.2 Hz, CH-5, 5.54 (1 H, dd, J, 10.3, 1.6 Hz, CH-4, 7.08-7.27 (10 H, m, 2 × C6H5, 13C NMR (100.6 MHz, CDCl3, δ, 32.46 NCH3, 38.20
    • 25NO: C, 83.34; H, 7.60; N, 4.23. Found: C, 83.25; H, 7.69; N, 4.13.
  • 73
    • 67649933128 scopus 로고    scopus 로고
    • PM3 calculations were performed using the HyperChem program (7.52 release).
    • PM3 calculations were performed using the HyperChem program (7.52 release).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.