Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Application In Synthesis of 5H-Pyrido[4,3-b]indole, Which mentioned a new discovery about 244-69-9
The present invention relates to compounds of formula (I), STR1 wherein A is an optionally substituted phenyl naphthyl, pyridyl, pyrazinyl, pyridazinyl, pyrimidyl, thienyl, thiazolyl, oxazolyl, thiadiazolyl having at least two adjacent ring carbon atoms or a bicyclic ring system, provided that the –CH(R3)N(R2)B–R1 and –OCH(R4 –)–D linking groups arm positioned in a 1,2 relationship to one another on ring carbon atoms and the ring atom positioned ortho to the –OCHR4 — linking group (and therefore in the 3-position relative to the –CHR3 NR2 — linking group) is not substituted; B is an optionally substituted ring system; D is an optionally substituted ring system; R1 is a variety of group as defined in the description; R2 is hydrogen, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, phenylC1-3 alkyl or 5- or 6-membered heteroarylC1-3 alkyl; R3 is hydrogen or C1-4 alkyl; R4 is hydrogen or C1-4 alkyl; and N-oxides of NR2 where chemically possible; and S-oxides of sulphur containing rings were chemically possible; and pharmaceutically acceptable salts and in vivo hydrolysable esters and amides thereof. Process for their preparation, intermediates in theirpreparation, their use as therapeutic agents and pharmaceutical compositions containing them.
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Reference：
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles