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Volumn , Issue 12, 2009, Pages 1929-1932

Efficient synthesis of functionalized 2,5-dihydropyrrole derivatives by Ph3P-promoted condensation between acetylene esters and α-arylamino ketones

Author keywords

aminoketones; 2,5 dihydropyrroles; Dialkyl acetylenedicarboxylates; Intramolecular Wittig reaction; Triphenylphosphine

Indexed keywords

ACETYLENE DERIVATIVE; ALKYL GROUP; AROMATIC AMINE; CARBOXYLIC ACID DERIVATIVE; CHROMIUM DERIVATIVE; ESTER DERIVATIVE; KETONE DERIVATIVE; PYRROLE DERIVATIVE; TRIPHENYLPHOSPHINE;

EID: 67749145447     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0029-1217516     Document Type: Article
Times cited : (18)

References (23)
  • 5
    • 67749136736 scopus 로고
    • U.S. Patent 4,220,655
    • Bohner, B.; Baumann, M. U.S. Patent 4,220,655, 1980.
    • (1980)
    • Bohner, B.1    Baumann, M.2
  • 16
    • 67749094336 scopus 로고    scopus 로고
    • General procedure for the preparation of compounds 3a-h: To a magnetically stirred solution of β-aminoketone (1 mmol) and triphenylphosphine (0.28 g, 1 mmol) in CH2Cl2 (10 mL, was added dropwise a mixture of dialkyl acetylenedicarboxylate (1 mmol) in CH 2Cl2 (5 mL) at room temperature. The reaction mixture was stirred for 24 h, then the solvent was removed under reduced pressure and the residue was purified by silica gel column chromatography (hexane-EtOAc, The solvent was removed under reduced pressure to afford the product. 3a: White powder; mp 110-112 ° C; IR (KBr, 1740, 1699 (ester) cm-1; Anal. Calcd for C21H20BrNO5: C, 56.52; H, 4.52; N, 3.14. Found: C, 56.51; H, 4.33; N, 3.17; MS: m/z, 445 (4, 1H NMR (500 MHz, CDCl3, δ, 3.70, 3.73 and 3.75 (9 H, 3 x s, 3 x OCH3, 4.50 1 H, dd, J, 15.7 Hz, J, 2.3 Hz
    • 2)
  • 23
    • 67749121591 scopus 로고    scopus 로고
    • General procedure for the preparation of compounds 7a-c: To a magnetically stirred solution of dihydropyrrole derivative 3 (1 mmol) in CHCl3 (10 mL, was added CrO3 (1 mmol) at room temperature. The reaction mixture was stirred for 4 h, then the solvent was removed under reduced pressure and the residue was purified by silica gel column chromatography (hexane-EtOAc, The solvent was removed under reduced pressure to afford the product. 7a: White powder; mp 123-125 ° C; IR (KBr, 1740, 1707 (ester) cm-1; Anal. Calcd for C21H 19NO5: C, 69.03; H, 5.24; N, 3.83. Found: C, 69.31; H, 5.19; N, 3.89; MS: m/z, 365 (34, 1H NMR (500 MHz, CDCl3, δ, 3.76, 3.86, 3.88 (9 H, 3 x s, 3 x OCH3, 6.98 and 7.30 (4 H, 2 x d, J, 9.0 Hz, ArH, 7.10 (1 H, s, CH of pyrrole, 7.28-7.45 (5 H, C6H5, 13C NMR 125.8 MHz, CDCl3
    • 3), 113.1, 121.9, 123.8, 125.7, 126.7, 127.8, 130.2, 131.0, 131.7, 132.8, 133.6, 159.2 (aromatic and olefinic carbons), 160.8, 167.2 (2 x CO ester).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.