Electric Literature of 128072-93-5, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 128072-93-5, name is Ethyl 5-chloropicolinate, molecular formula is C8H8ClNO2, The compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.
Intermediate A-28A: tert-Butyl (2-(5-chloropicolinoyl)-6-methoxyphenyl)carbamate [0351] tert-butyl 2-methoxyphenylcarbamate (548 mg, 2.454 mmol) in ether (6 mL) under N2 was added t-BuLi (3.2 mL, 5.44 mmol). After stirring for 2.5 h, the reaction mixture was cooled to -78 C. To the reaction mixture was added a solution of ethyl 5-chloropicolinate (564.5 mg, 3.04 mmol) in ether (12 mL) dropwise via cannula over 5 min. The reaction mixture was stirred for 60 min, and then warmed to room temperature. After 1.5 h, to the reaction mixture was added H2O with vigorous stirring. The reaction mixture was diluted with EtOAc, and the organic phase was separated, washed with sat NaCl then dried (Na2SO4), filtered and concentrated to yield the product Intermediate A-29A (511.5 mg, 57.4% yield)) as a yellow solid: 1H NMR (400 MHz, chloroform-d) delta ppm 8.55 (1H, dd, J=2.3, 0.6 Hz), 8.08 (1H, dd, J=8.4, 0.7 Hz), 7.80 (1H, dd, J=8.4, 2.4Hz), 7.16-7.25 (2H, m), 7.06 (1H, dd, J=7.5, 2.2Hz), 6.90 (1H, s), 3.92 (3H, s), 1.28 (9H, s).
According to the analysis of related databases, 128072-93-5, the application of this compound in the production field has become more and more popular.
Reference:
Patent; Gavai, Ashvinikumar V.; DeLucca, George V.; O’Malley, Daniel; Gill, Patrice; Quesnelle, Claude A.; Fink, Brian E.; Zhao, Yufen; Lee, Francis Y.; US2014/87992; (2014); A1;,
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