Реакция #214549

Уравнение реакции

2,6-dimethylaniline

ethyl α-bromopropionate

→

ethyl α-(2,6-dimethylanilino)propionate

Выход 40.0%

Растворители

benzene

Условия реакции

Методика

Chem. Soc. (1961), 3,303-3,308 discloses that 2,6-dimethylaniline and ethyl α-bromopropionate can be reacted in benzene to give ethyl α-(2,6-dimethylanilino)propionate. Though the reaction time is 96 hours, the yield achievable is only 37 percent. As is shown, however, in Chemische Berichte, 22 (1889), 1,792-1,795, the yield is virtually quantitative if the two sterically hindering substituents in the 2,6-position are absent, ie. if aniline is used as the starting material. A comparison of the reaction of aniline and of ortho-methylaniline with ethyl 2-chloropropionate for 12 hours at 120°-125° C. in the presence of sodium acetate (C.R. Acad. Sc. Paris, 264 (Series C, 1967), 1,864-1,865) shows a yield of 40 percent based on aniline and 20 percent based on ortho-methylaniline, and thus shows the effect of even one ortho-substituent. The same reaction with the methyl group in the meta-position or para-position instead of the ortho-position gives yields of 33 and 57 percent. Accordingly, the yield increases the more remote the substituent is from the amino group.

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