75139-39-8Relevant academic research and scientific papers
Cascade Benzannulation Approach for the Syntheses of Lipocarbazoles, Carbazomycins, and Related Alkaloids
Banerjee, Ankush,Saha, Shuvendu,Maji, Modhu Sudan
, p. 4343 - 4359 (2022/03/16)
Herein, a state-of-the-art one-pot cascade benzannulation technique for the efficacious synthesis of valuable 3-hydroxy-2-methyl carbazoles, a linchpin of more than 25 carbazole-based alkaloids, is unveiled from readily affordable fundamental commodities. The key step of this strategy is gaining aromaticity by site-selective elimination of hydroxyl group controlled by nucleophilicity of the indole ring. The present strategy shows excellent functional group tolerance with a broad substrate scope. The utility of this convenient approach was appealingly exemplified via concise total syntheses of 10 carbazole-based alkaloids possessing significant biological activities and thus of medicinal importance.
INDOLE-YNONE MEDIATED BENZOANNULATION PROCESS FOR THE PREPARATION OF CARBAZOLES- CARBAZOMYCIN A, CALOTHRIXIN B AND STAUROSPORINONE
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Page/Page column 24-25, (2020/10/20)
The present invention relates to carbazoles of general formula (I), and process for the preparation thereof: wherein 'R1' is H, C1-C6 alkyl, benzyl, or allyl; R2 is H, C1-C6 alkyl, cyclopropyl, phenyl, aryl, heteroaryl, or NO2; R3 is H, C1-C6 alkyl, cyclopropyl, phenyl aryl, heteroaryl, 4-methoxy phenyl, 4-ethyl phenyl, 2-methyl phenyl, or 2-Fluoro phenyl; R4 is H, benzoyl, -CO2Et, -CHO, Br, or -OMe; R5 is OH, OMOM, OMe, CN, or OTf; R6 is H, or O-alkyl; and R3-R4 is -CHNCH2CH2-. This invention also relates to the process for the preparation of carbazomycin A of Formula (1), calothrixin B of Formula (2) and staurosporinone of Formula (3) involving carbazoles of general formula (I) as an intermediate.
A General Carbazole Synthesis via Stitching of Indole-Ynones with Nitromethanes: Application to Total Synthesis of Carbazomycin A, Calothrixin B, and Staurosporinone
Singh, Shweta,Samineni, Ramesh,Pabbaraja, Srihari,Mehta, Goverdhan
, p. 3372 - 3376 (2019/05/10)
A new, one-pot domino benzannulation reaction between indole-3-ynones and various nitromethane derivatives has been explored for a general entry to diversely functionalized carbazole frameworks (28 examples). The scope of this new benzannulation has been
Total synthesis of carbazomycins A and B
Wu, Siyuan,Harada, Shinji,Morikawa, Takahiro,Nishida, Atsushi
, p. 178 - 183 (2018/02/09)
Total syntheses of carbazomycins A and B were demonstrated using a ytterbium-catalyzed Diels-Alder reaction with (silyloxyvinyl)indole as a diene. The densely substituted benzene ring of the target compound was successfully constructed by functionalization of a hydrocarbazolone intermediate and subsequent aromatization using N-bromosuccinimide.
A direct palladium-catalyzed route to selectively substituted carbazoles through sequential C-C and C-N bond formation: Synthesis of carbazomycin A
Della Ca', Nicola,Sassi, Giovanni,Catellani, Marta
supporting information; experimental part, p. 2179 - 2182 (2009/10/02)
The present paper offers a synthetically simple one-pot procedure for the catalytic preparation of the biologically interesting class of carbazoles. The new procedure is based on the combined catalysis of palladium and norbornene starting from o-substituted iodoarenes and N-sulfonylated or N-acetylated o-bromoanilines. A well-known member of this class, carbazomycin A, has been successfully prepared.
Transition metal complexes in organic synthesis, part 54.1 Improved total syntheses of the antibiotic alkaloids carbazomycin A and B
Knoelker, Hans-Joachim,Froehner, Wolfgang
, p. 6915 - 6918 (2007/10/03)
Considerably improved total syntheses of the carbazole antibiotics carbazomycin A and B are reported using a convergent iron-mediated one-pot construction of the carbazole framework by oxidative cyclization in the air.
Synthesis of the Carbazole Alkaloids Carbazomycin A and B and Hyellazole
Moody, Christopher J.,Shah, Pritom
, p. 376 - 377 (2007/10/02)
The first synthesis of carbazomycins A and B (1) is described; the route involves Diels-Alder reaction of 1-methylpyranoindol-3-one with ethyl 3-trimethylsilylpropynoate followed by functional group interconversions; the marine alkaloid hyellazole
