Benzo-b-carbazole

H-Benzo[a]carbazole, 4,4a,5,l 1,1 la,l Ib-hexahydro-synthesis, 4, 283 Benzo[b]carbazole, N-acetyl-photochemical rearrangements, 4, 204 Benzo[/]chroman-4-one, 9-hydroxy-2,2-dimethyl-synthesis, 3, 851 Benzochromanones synthesis, 3, 850, 851, 855 Benzochromones synthesis, 3, 821 Benzocinnoline-N-imide ring expansion, 7, 255 Benzocinnolines synthesis, 2, 69, 75 UV, 2, 127 Benzocoumarins synthesis, 3, 810 Benzo[15]crown-5 potassium complex crystal stmcture, 7, 735 sodium complex crystal stmcture, 7, 735 Benzo[ 18]cr own-6 membrane transport and, 7, 756 Benzo[b]cyclohepta[d]furans synthesis, 4, 106 Benzocycloheptathi azoles synthesis, 5, 120... 

Related substrates undergoing PFR include A-acetyl and A-(2-naphthoyl) esters of 5H- benzo [b] carbazole (Scheme 45) [121], Interestingly, the N-(2-naphthoyl) ester of carbazole 164 does not undergo PFR [121],... 

Preparation of ll-methoxy-5H-benzo[b]carbazole-l-carboxylic acid, methyl ester... 

Preparation of (5-benzyl-l-carbamoyl-5H-benzo[b]carbazol-ll-yloxy)-acetic acid, sodium salt... 

Tab. 15.1 Palladium(ll)-catalyzed oxidative cyclization to 4-methoxy-2-methyl-5H-benzo[b]carbazole-6,l 1-dione.

Enynecarbodiimides 364 form biradical intermediates 365, which undergo intra-molecular cycloaddition on heating to give benzo[b]carbazoles 366.3" ... 

Chuang has also described a manganese(III) acetate initiated oxidative free radical reaction between benzoylindoles 126 and dimethyl malonate which provides faeile access to benzo[b]carbazoles 127 <97H(45)347>. Similar reaction of N-benzoylindoles affords the corresponding indolo[ 1,2-b]isoquinolines. 

Palladium(II)-promoted oxidative cyclization was also applied to benzo[b]carbazole-6,ll-diones. <94T10893>... 

J 1-Dihydro-l J-dihydroxy-3-methyl-6,l l-dioxo-5H-benzo[b carbazole-5-carbonitrile, 9CI. Antibiotic PI [120796-24-9]... 

The enyne ketenimines 149 also cyclize intramolecularly to produce the benzo[b] carbazoles 150 . 

Indole-2,3-quinodimethane methodology has been utilized in the synthesis of the above groups of carbazoles 108). The N-sulphophenyl indole-2,3-quinodimethane anologue (136) undergoes the Diels-Alder reaction with benzyne generated from (137). In three steps (138-138B) it furnishes the simple benzo-b-carbazole (139). 

---