Tricyclohexylphosphine → 1,2,3,4-Tetrahydro-6-(triisopropylsilyl)thio cyclopent[b]indole

Palladium dibenzylidene-acetone (0.155 g, 5 mol %) and tricyclohexylphosphine (0.19 g, 20 mol %), were weighed out into a flask pre-flushed with argon, and subsequently flushed with argon for 5 min before dissolution in toluene (20 mL). The deep red mixture was stirred at room temperature for 5 minutes under argon, then 6-bromo-1,2,3,4-tetrahydrocyclopent[b]indole (0.8 g, 3.4 mmol) was added in one portion. After a further 5 min a solution of potassium (triisopropylsilyl)sulfide (Tetrahedron Letts., 1994, 35(20), 3221-3224 and 3225-6)) in tetrahydrofuran (6 mL) was added via syringe over 4 min The mixture was stirred for 45 min at room temperature, heated at 80° C. (bath temp) for 70 min then cooled to room temperature over 16 h. The mixture was partitioned between toluene (40 mL) and water (60 mL). The separated aqueous layer was extracted with toluene (30 mL) and the combined organic extracts were washed with brine (20 mL), dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified by column chromatography [SiO2; heptane-ethyl acetate (98:2) to (96:4)] to yield 1,2,3,4-tetrahydro-6-(triisopropylsilyl)thio cyclopent[b]indole as a pale yellow solid (0.85 g, 73%); NMR (400 MHz, CDCl3) δH 7.76 (1H, br s, NH), 7.43 (1H, d, J 1.5 Hz), 7.27-7.25 (1H, m), 7.18 (1H, dd, J 8.2, 1.5 Hz), 2.85 (2H, obs dt, J 6.9, 1.6 Hz), 2.79 (2H, obs t, J 7.0 Hz), 2.52 (2H, obs quint, J 7.0 Hz), 1.29-1.19 (3H, m), 1.08 (18H, d, J 7.0 Hz); HPLC: [Supelcosil ABZ+; 1.0 ml/min, methanol-10 mM aqueous ammonium acetate solution, (90:10)] 99% (11.1 min).

1. custompre-flushed with argon
2. customsubsequently flushed with argon for 5 min before dissolution in toluene (20 mL)
3. stirringwas stirred for 45 min at room temperature
4. temperatureheated at 80° C. (bath temp) for 70 min
5. temperaturethen cooled to room temperature over 16 h
6. customThe mixture was partitioned between toluene (40 mL) and water (60 mL)
7. extractionThe separated aqueous layer was extracted with toluene (30 mL)
8. washthe combined organic extracts were washed with brine (20 mL)
9. dry with materialdried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated in vacuo
12. customThe residue was purified by column chromatography [SiO2; heptane-ethyl acetate (98:2) to (96:4)]

ORD 기록

ord-428887d442ed4346bc4e80e2025780f5

출처 데이터셋

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US06706750B1