Tetrabutylammonium Fluoride → 2-chloro-7-cyclopentyl-6-diethoxymethyl-7H-pyrrolo[2,3-d]pyrimidine
Reaction equation
[Cl:1][C:2]1[N:7]=[C:6]([NH:8][CH:9]2[CH2:13][CH2:12][CH2:11][CH2:10]2)[C:5]([C:14]#[C:15][CH:16]([O:20][CH2:21][CH3:22])[O:17][CH2:18][CH3:19])=[CH:4][N:3]=1.CCCC[N+](CCCC)(CCCC)CCCC.[F-]>C1COCC1>[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[CH:14]=[C:15]([CH:16]([O:20][CH2:21][CH3:22])[O:17][CH2:18][CH3:19])[N:8]([CH:9]3[CH2:13][CH2:12][CH2:11][CH2:10]3)[C:6]=2[N:7]=1Participants
4
Procedure
To a stirred solution of [2-chloro-5-(3,3-diethoxy-prop-1-ynyl)-pyrimidin-4-yl]-cyclopentyl-amine (7.50 g, 23.3 mmol) in THF (45 mL) is added 1N TBAF in THF (100 mL, 116 mmol) at room temperature. The reaction mixture is heated under reflux overnight. After cooling the mixture is partitioned between H2O and dichloromethane. The phases are separated and the aqueous layer is extracted with dichloromethane (×2). The combined organic extracts are dried (MgSO4), filtered and concentrated. The residue is purified by SiO2 chromatography eluting with a gradient of 10% EtOAc/petrol to 30% EtOAc/petrol to give 2-chloro-7-cyclopentyl-6-diethoxymethyl-7H-pyrrolo[2,3-d]pyrimidine, (5.68 g, 76%). MS (ESI) m/z 324.1 (M+H)+