Potassium Phosphate, Tribasic → [3-(4-Benzyl-4,7-diaza-spiro[2.5]oct-7-yl)-naphthalen-1-yl]-acetic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

(3-Trifluoromethanesulfonyloxy-naphthalen-1-yl)-acetic acid ethyl ester (500 mg, 1.38 mmol) is dissolved under an atmosphere of argon in dry THF (10 ml). 4-Benzyl-4,7diaza-spiro[2.5]octane (325 mg, 1.61 mmol) is added, followed by the addition of K3PO4 (410 mg, 1.93 mmol), Pd2(dba)3 (62 mg, 0.069 mmol) and biphenyl-2-yl-di-tert-butyl-phosphane (21 mg, 0.069 mmol). The reaction mixture is heated to 80° C. After 4 h, TLC analysis indicates complete consumption of starting materials. The reaction mixture is cooled to RT, filtered and concentrated. The residue is purified by FCC (hexanes/EtOAc 100:0 to 90;10 to 80:20 to 70:30 to 0:100) to afford the title compound. 1H NMR (CDCl3, 400 MHz) δ 0.69 (ddd, 2H), 0.86 (ddd, 2H), 1.24 (t, J=7.0 Hz, 3H), 3.09 (ddd, 2H), 3.19 (s, 2H), 3.31 (ddd, 2H), 3.93 (s, 2H), 4.02 (s, 2H), 4.17 (q, J=7.0 Hz, 2H), 7.08 (s, 1H), 7.21 (s, 1H), 7.33 (m, 6H), 7.42 (dd, J=8.8 Hz, 1H), 7.71 (d, J=8.8 Hz, 1H), 7.88 (d, J=8.8 Hz, 1H); ES-MS: 415 [M+H]+.

Provenance & Evidence