2-Bromopropane → Ethyl (1aR,5aR)-2-Isopropyl-1a,2,5,5a-tetrahydro-1H-2,3-diazacyclopropa[a]pentalene-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

(1aR,5aR)-1a,2,5,5a-Tetrahydro-1H-2,3-diazacyclopropa[a]pentalene-4-carboxylic acid ethyl ester (0.100 g, 0.520 mmol) (from Example 1.4, Step A) was dissolved in anhydrous DMF (5.20 mL). CsCO3 (0.678 g, 2.081 mmol) was added to give a suspension which was stirred at 25° C. for several minutes. 2-Bromopropane (0.098 mL, 1.041 mmol) was added dropwise at 25° C. After stirring for 4 h, the reaction was diluted with EtOAc (50 mL), washed with water (2×10 mL), brine, and dried over MgSO4. The solvent was evaporated under reduced pressure. The oil residue was purified by silica gel column chromatography to give the title compound as an oil (0.073 g). LCMS m/z=235.3 [M+H]+; 1H NMR (400 MHz, CDCl3) ppm 0.29-0.35 (m, 1H), 1.12 (td, J=8.02, 4.93 Hz, 1H), 1.34 (t, J=7.20 Hz, 3H), 1.46 (dd, J=15.16, 6.57 Hz, 6H), 2.04-2.12 (m, 1H), 2.16-2.24 (m, 1H), 2.74-2.82 (m, 1H), 2.90-2.99 (m, 1H), 4.27 (q, J=7.07 Hz, 2H), 5.31-5.43 (m, 1H).

Provenance & Evidence