Ethyl 2-amino-2-cyanoacetate → Ethyl 2-cyano-2-formamidoacetate

To ethyl 2-amino-2-cyanoacetate (800 mg, 6.24 mmol) in dichloromethane (5 mL) was added cyanomethyl formate (531 mg, 6.24 mmol) in dichloromethane (5 mL) dropwise at 0° C. The reaction was warmed up to room temperature for twelve hours. The reaction was concentrated and purified by silica gel chromatography to give an oil of ethyl 2-cyano-2-formamidoacetate (500 mg). NMR spectrum shows a mixture of starting material and desired product in a 1:1 ratio. The product was dissolved in methylene chloride (10 mL). To this solution was added cyanomethyl formate (797 mg, 9.37 mmol) and the reaction was stirred for twelve more hours. The reaction was concentrated and purified with silica gel chromatography to give an oil of ethyl 2-cyano-2-formamidoacetate (460 mg). 1H NMR (400 MHz, CDCl3) δ 8.30 (s, 1H), 6.61 (s, 1H), 5.55 (d, 2H), 4.36 (q, 2H), 1.35 (t, 3H).

1. concentrationThe reaction was concentrated
2. custompurified by silica gel chromatography

ORD-Eintrag

ord-5731a8085595424fa69acfa77427fea3

Quelldatensatz

uspto-grants-2010_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07829572B2