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Volumn 52, Issue 1, 2011, Pages 65-68

Three component tandem reactions involving protected 2-amino indoles, disubstituted propargyl alcohols, and I2/ICl: Iodo-reactant controlled synthesis of dihydro-α-carbolines and α-carbolines via iodo-cyclization/iodo-cycloelimination

Author keywords

Carboline; Alkyne; Cyclization; Iodocycloelimination; Multicomponent reaction

Indexed keywords

2 AMINOINDOLE; ALCOHOL DERIVATIVE; CARBOLINE DERIVATIVE; INDOLE DERIVATIVE; IODINE; PROPARGYL ALCOHOL; UNCLASSIFIED DRUG;

EID: 78649880956     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2010.10.147     Document Type: Article
Times cited : (36)

References (43)
  • 37
    • 78649886089 scopus 로고    scopus 로고
    • See Supplementary data
    • See Supplementary data.
  • 39
    • 78649879835 scopus 로고    scopus 로고
    • note
    • 3 (0.250 g, 1.81 mmol) was added to the reaction mixture at 0 °C and the reaction mixture was allowed to stir at room temperature for 1 h. After completion of the reaction as analyzed by TLC, it was diluted with saturated sodium thiosulphate solution and extracted with EtOAc (20 mL × 3). The organic layer was washed with brine (10 mL), dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The crude product so obtained was purified on a silica gel column using hexane: ethyl acetate (1:9, v/v) as eluent to afford dihydro-α-carbolines 4. General procedure for the one-pot three-component tandem reaction leading to the synthesis of 3-iodo-α-carbolines 5: To a solution of 2-ethoxycarbonylamino-indole-1-carboxylic acid ethyl ester 1a (0.200 g, 0.73 mmol) and 1-(4-chloro-phenyl)-3-phenyl-prop-2-yn-1-ol 2a (0.175 g, 0.73 mmol) in acetonitrile (10 ml), iodine (0.920 g, 3.62 mmol) was added and stirred for 0.5 h at 0 °C to rt. Next, ICl (1 M solution in DCM, 3.4 ml) was added to the reaction mixture at 0 °C and the reaction mixture was allowed to stir at room temperature for 1 h. After completion of the reaction as analyzed by TLC, it was diluted with saturated sodium thiosulphate solution and extracted with EtOAc (20 mL × 3). The organic layer was washed with brine (10 mL), dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The crude product so obtained was purified on a silica gel column using hexane: ethyl acetate (1:19, v/v) as eluent to afford α-carbolines 5.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.