77507-52-9Relevant academic research and scientific papers
Synthesis of bis-4H-furo[3,4-b]indoles
McGowan, Meredeth A.,Perreault, Denise M.,Thornton, Nancy B.,Garaas, Sarah D.,Gribble, Gordon W.
, p. 334 - 347 (2018/09/10)
We describe the synthesis of two novel bis-4H-furo[3,4-b]indoles from indole. Several alternative pathways to these potential DNA bis-intercalator precursors are discussed, and the synthesis of a novel semi-rigid tether is reported.
New syntheses of pyrrolo[3,4-b]indoles, benzo[b]furo[2,3-c]pyrroles, and benzo[b]thieno [2,3-c]pyrroles utilizing the reaction of münchnones (1,3-oxazolium-5-olates) with nitroheterocycles
Gribble, Gordon W.,Pelkey, Erin T.,Switzer, Frank L.
, p. 1061 - 1062 (2007/10/03)
1,3-Dipolar cycloaddition of münchnones (mesoionic 1,3-oxazolium-5-olates) 3 and 4 with 2- and 3-nitroindoles, 2-nitrobenzo[b]furan, and 3-nitrobenzo[b]thiophene affords the corresponding pyrrolo[3,4-b]indoles, benzo[b]furo[2,3-c]pyrroles, and benzo[b]thi
Synthesis of Alkyl-Substituted N-Protected Indoles via Acylation and Reductive Deoxygenation
Ketcha, Daniel M.,Lieurance, Brett A.,Homan, Dominic F. J.,Gribble, Gordin W.
, p. 4350 - 4356 (2007/10/02)
The synthesis of 2-, 3-, and 5-alkyl-1-(phenylsulfonyl)indoles involving Friedel-Crafts acylation followed by reductive deoxygenation is described.The application of this acylation-deoxygenation sequence to 3-acyl-1-(phenylsulfonyl)indoles bearing potenti
A Facile Preparation of N-Benzensulphonylindoles Using Phase Transfer Catalyst
Selvakumaren, S.,Srinivasan, P. C.
, p. 692 (2007/10/02)
Treatment of an indole with benzenesulphonyl chloride in bezene - 50percent aq. sodium hydroxide solution in the presence of cetyltrimethylammonium bromide affords the corresponding N-benzenesulphonylindoles in 60-70percent yield.
A Convenient Synthesis of 3-Acylindoles via Friedel-Crafts Acylation of 1-(Phenylsulfonyl)indole. A New Route to Pyridocarbazole-5,11-quinones and Ellipticine
Ketcha, Daniel M.,Gribble, Gordon W.
, p. 5451 - 5457 (2007/10/02)
A Friedel-Crafts acylation of 1-(phenylsulfonyl)indoles (1) with carboxylic acid anhydrides and acid chlorides in the presence of aluminum chloride gives 3-acyl-1-(phenylsulfonyl)indoles (2) in 81-99percent yields.Base hydrolysis converts 2 to 3-acylindoles (3) in 79-96percent yields.The reaction of 1-(phenylsulfonyl)indole (1a) with oxalyl chloride gives acid chloride 2h, which is converted to 3-cyanoindole (7) in three steps (75percent yield).Although a similar Friedel-Crafts alkylation of 1 was unsuccessful, in some cases the 3-acyl-1-(phenylsulfonyl)indoles 2a,e,f could be reduced to 3-alkyl-1-(phenylsulfonyl)indoles 8a,b,c in nearly quantitative yield with sodium borohydride in trifluoroacetic acid.The acid chloride derived from keto acid 9 did not cyclize to the desired pyridocarbazole-5,11-quinone 24 but rather to chloro keto lactam 10.However, acylation of 1a with acid chloride 22 followed by strong-base-mediated cyclization gives 24.Since quinone 24 has been previously converted to the alkaloid ellipticine 26, this route to 24 represents a new synthesis of ellipticine.Related synthetic schemes give rise to quinones 16 and 20.
Synthesis and Diels-Alder Reactions of 1,3-Dimethyl-4-(phenylsulfonyl)-4H-furoindole. A new Annulation Strategy for the Construction of Ellipticine and Isoellipticine
Gribble, Gordon W.,Saulnier, Mark G.,Sibi, Mukund P.,Obaza-Nutaitis, Judy A.
, p. 4518 - 4523 (2007/10/02)
The novel fused heterocycle 1,3-dimethyl-4-(phenylsulfonyl)-4H-furoindole (4) is synthesized from 3-ethylindole (6) in six steps (46percent yield) or from indole-3-carboxaldehyde (12) in four steps (21percent yield).Furoindole 4 undergoes Diels-Alder reactions with dimethyl acetylenedicarboxylate, N-phenylmaleimide, benzyne, and 3,4-pyridyne (5) to give the expected adducts 17, 18a,b, 19, and 23a,b, respectively.Deoxygenation and desulfonylation of 19 and 23a,b, respectively, give benzocarbazole 22 and a readily separable mixture of the pyridocarbazole alkaloids ellipticine (1a) and isoellipticine (2a).
