N,N'-Dimethylethylenediamine → tert-Butyl methyl(2-(methylamino)ethyl)carbamate

Temperature

0 °C

tert-Butyl methyl(2-(methylamino)ethyl)carbamate was prepared as follows: N1,N2-dimethylethane-1,2-diamine (40 mmol) was dissolved in 100 mL of CH2Cl2 and cooled to 0° C. A solution of di-tert-butylcarbonate (4.0 mmol) in CH2Cl2 (10 mL) was then added dropwise at 0° C. over a period of 15 min. The resulting reaction mixture was stirred at 0° C. for 30 min and then warmed to room temperature. After stirring at room temperature for 2 h, the reaction mixture was diluted with CH2Cl2 (100 mL). The organic layer was washed with brine (3×25 mL), dried (Na2SO4) and concentrated under reduced pressure to afford tert-butyl methyl(2-(methylamino)ethyl)carbamate. This amine was subjected to the same reaction conditions outlined earlier in the preparation of (E)-methyl 4-(2-(4Z,7Z,10Z,13Z,16Z,19Z)-docosa-4,7,10,13,16,19-hexaenamidoethylamino)-4-oxobut-2-enoate. The desired product, namely (E)-methyl 4-(methyl(2-((4Z,7Z,10Z,13Z,16Z,19Z)—N-methyldocosa-4,7,10,13,16,19-hexaenamido)ethyl)amino)-4-oxobut-2-enoate, was obtained after purification by silica gel chromatography. MS (EI) calcd for C31H46N2O4: 510.35. found 511 (M+1).

1. customtert-Butyl methyl(2-(methylamino)ethyl)carbamate was prepared
2. customThe resulting reaction mixture
3. temperaturewarmed to room temperature
4. stirringAfter stirring at room temperature for 2 h
5. washThe organic layer was washed with brine (3×25 mL)
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated under reduced pressure

ORD record

ord-690be508524748aeb70e5a67254cf943

Source dataset

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08969354B2