Water → HCID 178506911, compound

Temperature

-40 °C

Bis(trimethylsilyl)methyllithium was prepared according to a procedure of Grobel and Seebach (B.Th. Grobel and D. Seebach, Chem. Ber.,1110, 852 (1977)); to a solution of bis(trimethylsilyl)methane (2.85 ml, 13.3 mmol) in THF (20 ml) and HMPT (5 ml) at -78° C. was added dropwise via syringe a solution of s-BuLi (7.66 ml of 1.74 M in pentane). The resultant pale green solution was allowed to warm to -40° C. After 8 h at -40° C., the resultant red solution was cooled to -78° C. and a solution of bicyclo[4.3.1]dec-2-ene-10-one2 (2.00 g, 13.3 mmol) in THF (5 ml) was added. The reaction was allowed to warm to -5° C. over 13 h, then stirred with H2O (50 ml) and extracted into hexane (2×50 ml). The combined hexane layers were washed with H2O (4×100 ml) and brine (100 ml), dried over Na2SO4 and evaporated to give 3.00 g of yellow oil, which was purified via column chromatography with silica gel. After elution with EtOAc/hexane, some starting ketone, 0.35 g, was recovered and the desired diene 3 was isolated as a colorless oil, 1.64 g (56.0% yield).

1. temperaturethe resultant red solution was cooled to -78° C.
2. temperatureto warm to -5° C. over 13 h
3. extractionextracted into hexane (2×50 ml)
4. washThe combined hexane layers were washed with H2O (4×100 ml) and brine (100 ml)
5. dry with materialdried over Na2SO4
6. customevaporated

ORD record

ord-9eb8f536484640288c62e232f3bdd137

Source dataset

uspto-grants-1991_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05019590