Sodium hydride → HCID 58382965, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of (+−)-8-methoxy-6,11-dihydro-5-thia-11-aza-benzo[a]fluorene-6-carboxylic acid diethyl amide (51) (150 mg, 0.41 mmol; prepared according to Example 17(b)) in anhydrous DMF (4 ml) was added 2-fluoroethyl tosylate (166 mg, 0.82 mmol), prepared as described in L. Cronin et al (J. Org. Chem. 2004; 69: 5934-5946) followed by sodium hydride 60% dispersion in mineral oil (34 mg, 0.82 mmol) under nitrogen. The reaction mixture was heated at 80° C. for 1 h. After cooling, the solvents were removed in vacuo, the residue quenched with water (30 ml), extracted with DCM (2×30 ml), dried (MgSO4) and solvents removed in vacuo. The residue was purified by column chromatography on silica, eluting with 5-10% EtOAc/CH2Cl2. The crude solid was quenched with ether/pet.spirit, filtered, dried in vacuo (45° C.) to give the title compound (non-radioactive tetracyclic indole imaging agent) (77 mg, 46%) as a pale brown solid. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δ 1.12 (t, J=7.0 Hz, 3H), 1.36 (t, J=7.0 Hz, 3H), 3.25-3.70 (m, 4H), 3.83 (s, 3H), 4.45-4.70 (m, 2H), 4.80 (t, J=5.2 Hz, 1H), 4.96 (t, J=5.2 Hz, 1H), 5.09 (s, 1H), 6.84-6.93 (m, 2H), 7.13-7.32 (m, 3H), 7.46 (m, 1H), 7.58 (d, J=8.0 Hz, 1H).

Provenance & Evidence