Abstract: The present invention relates to quinolones of formula (I) and process for its preparation by amine insertion into aryl-ynones thereof. [Formula I] The invention further relates to the process to obtain the natural products such as: graveoline, graveolinine, pseudane IV, pseudane VII, pseudane VIII and pseudane XII. The invention also describes the process for the total synthesis of waltherione F in concise approach from the quinolone synthesized.

Abstract: 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.