Triethylamine → Methyl-2-di(2chloroethyl)aminocarbonylamino-3-(4-hydroxyphenyl)proponoate

Participants

Reaction Steps

bis-(2-Chloroethyl)amine hydrochloride 26 (200 mg, 1.1 mmol) was dissolved in dichloromethane (15 mL) and triethylamine (0.45 mL, 3.3 mmol) was added. The mixture was stirred for 5 minutes at ambient temperature and methyl chlorothioformate (1.32 mmol) was added. The mixture was stirred until no bis-(2-chloroethyl)amine remained by TLC (ethyl acetate). Tyrosine methyl ester (411 mg, 2.1 mmol) was added and the mixture was heated under reflux for 4 hours. The mixture was allowed to cool purified by dry flash column chromatography (silica gel, dichloromethane 200 mL) and concentrated in vacuo to yield prodrug 30 as an orange/brown oil (278 mg, 60%). νmax 3400, 1740, 1660, 1444, 1380, 1145/cm−1; δ 1H (400 MHz, CDCl3) 2.32 (3H, s, CH3) 2.60 (2H, t, J 3.72 Hz, CH2Ar), 2.64 (3H, s, CH3) 3.12–3.25 (9H, m, ArCH2CH, 2×CH2CH2Cl), 6.67 (2H, d, J 5.7 Hz, 2×ArH), 6.9 (2H, d, J 5.7 Hz, 2×ArH), 7.82 (1H, brs, NH);. 13C (100 MHz, CDCl3) 29.8 (CH2), 43.3 (CH2), 44.1 (CH2), 44.2 (CH2), 45.2 (CH2), 46.6 (CH2), 47.1 (CH3) 115.9 (2×CH), 130 (2×CH), 130.1 (C), 155.6 (C), 160.3 (C) 161.5 (C). m/z (Cl) 242 (72%), 227 (45), 183 (75) 152 (100), 121 (45), 108 (35).

Provenance & Evidence