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Volumn 20, Issue 8, 2009, Pages 909-912

N-Substituted benzoxazolyl ureas and thioureas in Biginelli reaction promoted by trifluoromethane sulfonic acid: An efficient and convenient synthesis of substituted benzoxazolyl 3,4-dihydropyrimidine (1H)-(thio)-ones

Author keywords

Ketoester; N substituted semicarbazides and thiosemicarbazides; Substituted benzoxazolyl 3,4 dihydropyrimidine (IH) (thio) ones; Trifluoromethane sulfonic acid

Indexed keywords


EID: 67449088158     PISSN: 10018417     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.cclet.2009.04.010     Document Type: Article
Times cited : (10)

References (26)
  • 8
    • 67449088295 scopus 로고    scopus 로고
    • D. Nagarathnam, W.C. Wong, S.W. Miao, et al. PCT Int. WO 97 17969.
    • D. Nagarathnam, W.C. Wong, S.W. Miao, et al. PCT Int. WO 97 17969.
  • 26
    • 67449085129 scopus 로고    scopus 로고
    • Selected compounds analytical data: 3a: white crystalline solid, yield 68, mp 138-140 °C; IR (KBr, υ1665, 1690, 3265, 3349, 3382 cm-1; 1H NMR (300 MHz, CDCl3, δ ppm, 6.5 (s, 2H, CONH2, 6.8 (d, 1H, 7.7 (d, 1H, 8.0 (s, 1H, 8.4 (s, 1H, 9.2 (s, 1H, NH, 10.4 (s, 1H, CONH, MS: m/z 221 (M+1, Anal. calcd. for C9H8N4O3; C, 49.53; H, 3.68; N, 25.49. Found: C, 49.55; H, 3.66; N, 25.45, 3d: white crystalline solid, yield 78, mp 132-134 °C IR (KBr, υ1668, 1685, 3110, 3219, 3337 cm-1; 1H NMR (300 MHz, CDCl3, δ ppm, 2.3 (s, 3H, CH3, 3.6 (s, 2H, CSNH2, 6.82 (d, 1H, 7.4 (d, 1H, 8.4 (s, 1H, 9.2 (s, 1H, NH, 10.4 (s, 1H, CONH, MS: m/z 251 M+1, Anal. calcd. for C9H8N4O2S; C, 45.95; H, 4.08; N, 22.42. Found: C, 47.99; H, 4.03; N, 22.39, 6a: white crystalline
    • 3, δ ppm)


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.