Acetylene → Androst-16-ene

Temperatur

-10 °C

To a solution of butyllithium (2.84 ml of a 1.6 M solution in hexane, 4.5 mmol) in dry tetrahydrofuran (THF, 45 ml) was added dropwise a solution of acetylene 9 (500 mg, 1.13 mmol) in dry THF (10 ml) at -40° C. The reaction mixture was then allowed to warm up to -10° C. and stirred for 1 h. At his temperature, a solution of 1,10-diiododecan (2.15 g, 5.4 mmol) in dry THF (5 ml) was added in one portion. The cooling bath was removed and the reaction mixture was stirred at room temperature for 15 h. Then, the solution was diluted with 100 ml of ether and was washed with water (6×30 ml), dried, filtered and concentrated to an oil. The residue was purified by flash chromatography (hexane:acetone, 96:4), followed by preparative thin-layer chromatography (TLC) to give 208 mg, 26% of compound 10 (n=10)

1. customThe cooling bath was removed
2. stirringthe reaction mixture was stirred at room temperature for 15 h
3. additionThen, the solution was diluted with 100 ml of ether
4. washwas washed with water (6×30 ml)
5. customdried
6. filtrationfiltered
7. concentrationconcentrated to an oil
8. customThe residue was purified by flash chromatography (hexane:acetone, 96:4)

ORD-Eintrag

ord-44298cb65d994fa1a1270ab55f2ce1e8

Quelldatensatz

uspto-grants-1996_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05585405