Sodium Iodide → HCID 118060815, Verbindung

The solution of ethyl 3-methylenecyclobutanecarboxylate (1 g, 7.13 mmol), NaI (0.214 g, 1.427 mmol) and TMSCF3 (2.54 g, 17.83 mmol) in THF (10 mL) was stirred at 65° C. for 2 h. The reaction mixture was quenched with a 10% aq. solution of NaHCO3 and the aqueous layer was extracted with diethyl ether (3×10 mL). The combined organic layer was washed with a 10% aq. solution of NaHCO3, followed by brine, then dried over Na2SO4, filtered and the filtrate concentrated. The crude was purified by silica gel chromatography (12 g REDISEP® column, eluting with 20% EtOAc in hexane). Fractions containing the product were combined and evaporated to afford Intermediate 320A as a pale yellow liquid (1 g, 73%, mixture of cis and trans isomers). 1H NMR (400 MHz, chloroform-d) δ ppm 4.13-4.24 (m, 2H) 2.56-2.65 (m, 1H), 2.01-2.06 (m, 2H), 1.91-1.98 (m, 2H) 1.16-1.45 (m, 5H).