Water → (Z)-5-Acetylamino-2,4,6,7-tetramethyl-2-styryl-2,3-dihydrobenzofuran

Temperatur

-20 °C

A suspension of benzyltriphenylphosphonium chloride (0.7 g, 1.8 mmol) in tetrahydrofuran (10 ml) was cooled to -20° C. and n-butyllithium hexane solution (1.6M, 1.12 ml, 1.8 mmol) was added dropwise. The reaction mixture was stirred for 30 minutes and then a solution of 5-acetylamino-2-formyl-2,4,6,7-tetramethyl-2,3-dihydrobenzofuran (0.45 g, 1.7 mmol) in tetrahydrofuran (5 ml) was added. The reaction mixture was stirred at room temperature for additional 30 minutes. Water was added to the reaction mixture and the product was extracted with ethyl acetate. The extract was washed with water, dried and then concentrated. The residue was purified by column chromatography on silica gel (isopropyl ether-ethyl acetate, 1:1) to obtain the desired compound (0.44 g, yield: 76.2%) as oil.

1. stirringThe reaction mixture was stirred at room temperature for additional 30 minutes
2. extractionthe product was extracted with ethyl acetate
3. washThe extract was washed with water
4. customdried
5. concentrationconcentrated
6. customThe residue was purified by column chromatography on silica gel (isopropyl ether-ethyl acetate, 1:1)

ORD-Eintrag

ord-58df597f495940dda9f2b60e6efab7b3

Quelldatensatz

uspto-grants-1997_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05594154