Ethyl 2-acetyl-3-(dimethylamino)acrylate

Chemical Properties

Yellow Oil

Uses

Ethyl 2-Dimethylaminomethylene-3-oxobutanoate (cas# 51145-57-4) is a compound useful in organic synthesis.

Synthesis

The general procedure for the synthesis of ethyl (Z)-2-((dimethylamino)methylene)-3-oxobutanoate from ethyl acetoacetate and N,N-dimethylformamide dimethyl acetal was as follows: referring to Example 75, ethyl acetoacetate (79 mL, 0.62 mol) was added to N,N-dimethylformamide dimethyl acetal (100 mL, 0.68 mol) and the mixture was heated to reflux for 1 hour. Upon completion of the reaction, the excess acetal was removed by subtractive distillation, followed by subtractive distillation of the residue to afford the target product (Z)-ethyl (Z)-2-((dimethylamino)methylene)-3-oxobutanoate (85 g, 74% yield). The boiling point of the product was 125-130 °C (400 Pa).1H-NMR (CDCl3) δ: 1.33 (3H, t, J = 7.1 Hz), 2.33 (3H, s), 3.04 (6H, br s), 4.23 (2H, q, J = 7.1 Hz), 7.68 (1H, s).

References

[1] Patent: WO2006/73361, 2006, A1. Location in patent: Page/Page column 147
[2] Patent: US2007/244088, 2007, A1. Location in patent: Page/Page column 38
[3] Patent: US2008/9523, 2008, A1. Location in patent: Page/Page column 18; 19
[4] Patent: WO2008/4943, 2008, A1. Location in patent: Page/Page column 59
[5] Patent: WO2008/4942, 2008, A1. Location in patent: Page/Page column 56