N,N,N',N'-Tetramethylethylenediamine → 6'-Bromospiro[cyclopentane-1,3'-indolin]-2'-one

온도

-20 °C

n-Butyl lithium (2.5 M in hexanes, 3.8 mL, 9.5 mmol) was added dropwise over 30 minutes to a stirred suspension of 6-bromoindolin-2-one (preparation 1, 1.00 g, 4.7 mmol) and N,N,N′,N′-tetramethylethylenediamine (1.42 mL, 9.4 mmol) in tetrahydrofuran (20 mL) at −78° C. The mixture was stirred for 1 hour, then 1,4-diiodobutane (3.11 mL, 23.6 mmol) was added dropwise over 5 minutes. The mixture was warmed to −20° C. over a 1 hour period, was stirred for a further hour at this temperature and was then warmed to room temperature. After 3 hours stirring at room temperature, saturated aqueous ammonium chloride solution was added to the reaction and the mixture was extracted with ethyl acetate. The organic layer was washed with water, brine, dried (MgSO4) and evaporated. Purification of the residue by flash chromatography (10:1 hexanes/ethyl acetate) gave the title compound (0.57 g, 45%) as a pale pink solid.

1. stirringwas stirred for a further hour at this temperature
2. temperaturewas then warmed to room temperature
3. stirringAfter 3 hours stirring at room temperature
4. extractionthe mixture was extracted with ethyl acetate
5. washThe organic layer was washed with water, brine
6. dry with materialdried (MgSO4)
7. customevaporated
8. customPurification of the residue by flash chromatography (10:1 hexanes/ethyl acetate)

ORD 기록

ord-4e9641845ee34b83a1e636ba7d59c737

출처 데이터셋

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08450341B2