Cyclopropanecarboxaldehyde → HCID 22676744, compound

Participants

Reaction Steps

Cyclopropanecarboxaldehyde (168 mg, 2.4 mmol) was added to a stirred mixture of ethyl 5-amino-3-(4-tert-butylphenyl)-1-(3-methoxybenzyl)-1H-indole-2-carboxylate (Example 160, 530 mg, 1.2 mmol) in toluene (12 mL) and molecular sieves (2 g). The reaction was stirred for 16 h and then filtered using toluene to rinse. The filtrate was concentrated in vacuo and the residue was dissolved in methanol (12 mL). Sodium borohydride (15 mg, 1.2 mmol) was added and the reaction was stirred for 2 h. The mixture was diluted with ethyl acetate (50 mL), washed with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. Flash chromatography of the residue over silica gel using 4:1 hexane/ethyl acetate afforded 480 mg (78%) of desired product. The product had: 1H NMR (300 MHz, acetone-D6) δ 7.45-7.48 (m, 2 H), 7.34-7.38 (m, 2 H), 7.31 (d, 1 H), 7.18 (dd, 1 H), 6.87 (dd, 1H), 6.77 (ddd, 1 H), 6.65-6.70 (m, 2 H), 6.62 (d, 1 H), 5.75 (s, 2 H), 4.68 (s, 1 H), 4.08 (q, 2 H), 3.69 (s, 3 H), 2.89 (d, 2 H), 1.37 (s, 9 H), 1.00-1.10 (m, 1 H), 0.93 (t, 3 H), 0.42-0.49 (m, 2 H), 0.16-0.25 (m, 2 H).

Provenance & Evidence