With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.6960-46-9,Ethyl 7-nitro-1H-indole-2-carboxylate,as a common compound, the synthetic route is as follows.,6960-46-9
Preparation 29: Synthesis of 7-(tetrahydro-pyran-4-ylamino)-1H-indole-2-carboxylic acidEthyl 7-nitroindole-2-carboxylate (2.5 g, 10.7 mmol) was dissolved in methanol (50 ml). 10% Pd/C (200 mg) was added, and the mixture was stirred for 1 h under hydrogen gas. The mixture was filtered through celite, and the filtrate was distilled under reduced pressure. The distillate was dissolved 1,2-dichloroethane (50 ml), and tetrahydro-4H-pyran-4-one (1.3 ml, 12.8 mmol) and sodium triacetoxyborohydride (3.4 g, 16.1 mmol) were added. The mixture was stirred for 8 h at room temperature. After completion of the reaction, water was added. The mixture was extracted with ethyl acetate, dried over anhydrous magnesium sulfate and filtered. The filtrate was distilled under reduced pressure and concentrated. The residue was purified by column chromatography. Thus obtained compound was dissolved in methanol (50 ml) and tetrahydrofuran (50 ml), 1N-sodium hydroxide (43 ml, 42.8 mmol) was added, and the mixture was stirred for 8 h at room temperature. 1N-hydrochloric acid solution was added, and the mixture was extracted with ethyl acetate, dried over anhydrous magnesium sulfate and filtered. The filtrate was distilled under reduced pressure to give the title compound (2.1 g, Yield 76%).1H-NMR (400 MHz, DMSO-d6); delta 12.87 (br s, 1H), 11.46 (s, 1H), 6.97 (d. J=2.0 Hz, 1H), 6.86 (d, J=1.6 Hz, 1H), 6.85 (s, 1H), 6.37 (m, 1H), 5.73 (br s, 1H), 3.90 (m, 2H), 3.61 (m, 1H), 3.50 (m, 2H), 2.00 (m, 2H), 1.48 (m, 2H)Mass spectrum (ESI, m/z): Calculated: 260.12, Found: 260.30
The synthetic route of 6960-46-9 has been constantly updated, and we look forward to future research findings.
Reference£º
Patent; Kim, Soon Ha; Kim, Hyoung Jin; Chung, Chul Woong; Park, Heui Sul; Kwak, Hyo Shin; Kim, Sung Ho; Park, Jin Gu; US2010/291533; (2010); A1;,
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