Reactions of 1,2-Bis(1H-indol-2-yl)ethane: Formation of Indolo[2,3-c]carbazole and Cyclohept[1,2-b:5,4-b′]bisindole Derivatives
摘要:
1,2-Bis(1H-indol-2-yl)ethane (9) has been prepared and converted into indolo[2,3-c]carbazole (8) using palladium acetate in refluxing acetic acid. Reaction of 9 with CoF3 in hot TFA led to isolation of cyclohept[1,2-b:5,4-b']bisindole derivatives 11 and 12, which could be elaborated into further derivatives. Treatment of 9 with orthoesters, aldehydes and ketones under acidic conditions afforded additional bisindoles containing a seven-membered ring. (C) 2000 Elsevier Science Ltd. All rights reserved.
Reactions of 1,2-Bis(1H-indol-2-yl)ethane: Formation of Indolo[2,3-c]carbazole and Cyclohept[1,2-b:5,4-b′]bisindole Derivatives
摘要:
1,2-Bis(1H-indol-2-yl)ethane (9) has been prepared and converted into indolo[2,3-c]carbazole (8) using palladium acetate in refluxing acetic acid. Reaction of 9 with CoF3 in hot TFA led to isolation of cyclohept[1,2-b:5,4-b']bisindole derivatives 11 and 12, which could be elaborated into further derivatives. Treatment of 9 with orthoesters, aldehydes and ketones under acidic conditions afforded additional bisindoles containing a seven-membered ring. (C) 2000 Elsevier Science Ltd. All rights reserved.
The construction of the ring-expanded carbazole system, forming arcyriaflavin homologues, is efficiently accomplished by the reaction of 2,2'-bridged bis-indoles with 3,4-dibromo-2,5-dihydro-1H-2,5-pyrroledione derivatives under Grignard conditions. A ring size of up to nine members in the central ring is achievable. Substitutions either at the indole system or at the imide-N are also possible. The
The reactivity of pyridinium salts 2 towards nucleophiles has been studied. The interaction with enolates derived from esters 1 gave only trace amounts of the expected compounds 3. Irreversible-type additions, however, allowed the preparation of indolyldihydropyridines 8 and 9 with high yields. Reaction of organometallic 10 with salt 2c, followed by acidic cyclization, afforded tetracycle 12.
[EN] CYCLIC DELOCALIZED CATIONS CONNECTED BY SPACER GROUPS<br/>[FR] CATIONS DELOCALISES CYCLIQUES CONNECTES PAR DES GROUPES D'ESPACEMENT
申请人:COVALENT ASSOCIATES INC
公开号:WO2001004097A2
公开(公告)日:2001-01-18
Cyclic delocalized cations joined together by spacer groups, with anions of equal number to cations to maintain charge neutrality, are disclosed. These spacer groups may be organic or inorganic in origin and may vary in length. The spacer groups may be saturated, containing single bonds, or may be unsaturated, containing double and triple bonds. With appropriate design these materials can have melting and glass transition temperatures below, around, and above room temperature. The lyophobic character of these materials may be adjusted, providing unique properties. These materials are well suited for use as electrolytes, lubricants, solvents for extractions and for running reactions, biphase catalysis media, media for electroluminescent and electrochromic devices.
Reactions of 1,2-Bis(1H-indol-2-yl)ethane: Formation of Indolo[2,3-c]carbazole and Cyclohept[1,2-b:5,4-b′]bisindole Derivatives
1,2-Bis(1H-indol-2-yl)ethane (9) has been prepared and converted into indolo[2,3-c]carbazole (8) using palladium acetate in refluxing acetic acid. Reaction of 9 with CoF3 in hot TFA led to isolation of cyclohept[1,2-b:5,4-b']bisindole derivatives 11 and 12, which could be elaborated into further derivatives. Treatment of 9 with orthoesters, aldehydes and ketones under acidic conditions afforded additional bisindoles containing a seven-membered ring. (C) 2000 Elsevier Science Ltd. All rights reserved.