2-Bromo-4,6-dimethylaniline → N-(2-Bromo-4,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl) dimethylsilanamine

Under and argon atmosphere, to a solution of 14.8 g (74.2 mmol) of 2-bromo-4,6-dimethylaniline in 200 ml of THF, 29.7 ml of 2.5 M (74.2 mmol) nBuLi in hexanes was added at −80° C. This mixture was warmed for ca. 1 hour to ambient temperature. Then, the resulting solution was added dropwise for ca. 1 hour while vigorously stirring to a solution of 18.0 g (74.2 mmol) of chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane in 100 ml of THF. The resulting mixture was stirred overnight at ambient temperature, then, evaporated to dryness. To the residue, 150 ml of toluene was added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 168-172° C./0.2 mm Hg. The product crystallizes slowly at ambient temperature. Yield 16.5 g (55%).

1. temperatureThis mixture was warmed for ca. 1 hour to ambient temperature
2. additionThen, the resulting solution was added dropwise for ca. 1 hour
3. customevaporated to dryness
4. additionTo the residue, 150 ml of toluene was added
5. filtrationThis mixture was filtered through a glass frit (G4)
6. customThe filtrate was evaporated to dryness
7. distillationFractional distillation
8. customgave a yellow liquid, bp 168-172° C./0.2 mm Hg
9. customThe product crystallizes slowly at ambient temperature

ORD-Eintrag

ord-35f68668ca2847aa9ae27e4f86ce4f4e

Quelldatensatz

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07868197B2