N,N,N',N',N'',N''-Hexamethylmethanetriamine → 5-diethylcarbamoyl-4-((E)-2-dimethylamino-vinyl)-5-ethyl-2-oxo-2,5-dihydro-furan-3-carboxylic acid ethyl ester

To a solution of 500.0 mg of compound (12) as obtained from example 5 (22.73 mmol) in 3.0 mL dimethyl formamide were added at room temperature 3.0 mL tris(dimethylamino)methane (17.3 mmol, 10.3 eq). The color of the reaction mixture changed from orange to brown and further to green. After 17 h, the mixture was diluted with 50 mL dichloromethane, washed with 25mL aqueous hydrochloric acid (1.0 M) and washed again three times with 50 mL brine. The organic phase was dried over 2 g sodium sulfate and was filtered. The filter cake was washed with 4 mL dichloromethane. After evaporation of the solvent in a rotary evaporator (50° C., 5 mbar), the crude product was obtained as an orange oil (627.0 mg, 106% by weight), which was liberated from residual dimethyl formamide in a high vacuum rotary evaporator (50° C., 0.5 mbar) yielding the title product (536.0 mg, 1.517 mmol, 90% by weight) as orange crystals.

1. washwashed with 25mL aqueous hydrochloric acid (1.0 M)
2. washwashed again three times with 50 mL brine
3. dry with materialThe organic phase was dried over 2 g sodium sulfate
4. filtrationwas filtered
5. washThe filter cake was washed with 4 mL dichloromethane
6. customAfter evaporation of the solvent
7. customin a rotary evaporator (50° C., 5 mbar)
8. customthe crude product was obtained as an orange oil (627.0 mg, 106% by weight), which
9. customwas liberated from residual dimethyl formamide in a high vacuum rotary evaporator (50° C., 0.5 mbar)

ORDレコード

ord-2407a8bc04a94897837d24baff3ecaa2

出典データセット

uspto-grants-2008_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07423152B2