A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: 71086-99-2, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 71086-99-2, Name is Ethyl 5-Aminoindole-2-carboxylate, molecular formula is C11H12N2O2. In a Patent, authors is ，once mentioned of 71086-99-2
5 – (Substituted carbonylamino-) – 1 H – indole – 2 – hydrazine derivative and its preparation method and application. Preparation method: 1) a synthetic intermediate of the pyruvic acid ethyl ester to the nitrobenzene zong; 2) the preparation of intermediate 5 – nitro-indole – 2 – carboxylic acid ethyl ester; 3) the preparation of intermediate 5 – amino – 1 H – indole – 2 – carboxylic acid ethyl ester; 4) the preparation of intermediate 5 – (substituted carbonylamino-) – 1 H – indole – 2 – carboxylic acid ethyl ester; 5) the preparation of intermediate 5 – (substituted carbonylamino-) – 1 H – indole – 2 – carbohydrazide; 6) preparation N’ – substituted methylene – 5 – (substituted carbonylamino-) – 1 H – indole – 2 – carbohydrazide derivatives. The states one kind N’ – substituted methylene – 5 – (substituted carbonylamino-) – 1 H – indole – 2 – carbohydrazide derivatives can be in the preparation for preventing or treating relates to CDK9 receptor related disorder medicament application. The advantages of low cost, high yield, the reaction process is simple and easy to control, with anticancer activity. (by machine translation)
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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