Water → HCID 86658346, compound

Participants

Reaction Conditions

Reaction Steps

Pd(PPh3)4 (10 mg, 0.09 mmol) was added to a degassed solution of (R)-4-chloro-5-methyl-6,7-dihydro-5H-cyclopenta-[d]-pyrimidine (300 mg, 1.78 mmol) and a 0.5M solution of 5-ethoxycarbonyl-2-thienylzinc bromide in THF (3.6 mL, 1.78 mmol). The reaction mixture was stirred at 70° C. for 16 hours and then it was cooled to room temperature and diluted with diethyl ether (10 mL). Water was added (5 mL) and a precipitate was formed and filtered. The solid was washed with more diethyl ether and the filtrate was concentrated. The resulting oil was purified on silica gel (0%-75% EtOAc/hexanes) to yield (R)-ethyl 5-(5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)thiophene-2-carboxylate as an oil (400 mg, 78%). m/z: 289 (MH+), 1H NMR (CDCl3): δ (ppm) 8.95 (s, 1H), 7.84-7.82 (m, 1H), 7.70-7.69 (m 1H), 4.39 (dq, 2H, J1=7.2 Hz, J2=1.2 Hz), 3.77 (quint., 1H, J=7.2 Hz), 3.23-1.14 (m, 1H), 3.001-2.95 (m, 1H), 2.42-2.31 (m, 1H), 1.98-1.92 (m, 1H), 1.40 (dt, 3H, J1=7.2 Hz, J2=1.2 Hz), 1.29 (d, 3H, J=7.2 Hz).

Provenance & Evidence