Diisopropylethylamine → HCID 178456065, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of compound 111 (65.6 mmol, 1 eq), 6-bromopurine (14.6 g, 73.4 mmol, 1.1 eq), and DIEA (24.3 mL, 140 mmol, 2 eq) in tert-butanol (40 mL) was stirred for 24 h at 80° C. The reaction mixture was concentrated in vacuo and treated with water to yield a solid crude product that was collected by vacuum filtration, washed with water, and air dried. Half of the obtained solid crude product was dissolved in MeOH (600 mL), concentrated onto silica gel (300 mL dry), and purified by flash chromatography (7.5×36 cm, eluted with 10 L of 4% MeOH/CH2Cl2) to yield a solid product. The solid product was then dissolved in EtOH (250 mL) and concentrated in vacuo to compound 107 as a light yellow solid (7.2 g, 50%). 1H NMR (300 MHz, 80° C., DMSO-d6) δ 12.66 (broad s, 1H), 8.11 (s, 1H), 8.02 (broad s, 1H), 7.81-7.73 (m, 1H), 7.60-7.42 (m, 6H), 7.25-7.15 (m, 2H), 4.97 (broad s, 1H), 2.02-1.73 (m, 2H), 0.79 (t, J=7.3 Hz, 3H). ESI-MS m/z 416.2 (MH+). C, H, N elemental analysis (C22H18N7OF.EtOH.0.4 H2O). Chiral purity 99.8:0.2 (S:R) using chiral HPLC (4.6×250 mm Chiralpak ODH column, 20° C., 85:15 hexanes:EtOH, 1 mL/min, sample loaded at a concentration of 1 mg/mL in EtOH). The reaction described above and compound 107 are shown below.

Provenance & Evidence