“…The reaction mixture was stirred under air for 5 min and concentrated. The crude product was purified by silica gel chromatography (100% EtOAc) to afford the product as colorless oil (266 mg, 68%): R f = 0.20 (100% EtOAc); IR (neat) 3420 cm –1 ; 1 H NMR (400 MHz, CDCl 3 ) δ 6.05–6.01 (m, 2H), 5.07 (t, J = 4.8 Hz, 2H), 2.10 (t, J = 5.0 Hz, 2H), 1.56 (br s, 2H); 13 C NMR (101 MHz, CDCl 3 ) δ 137.4, 76.4, 44.4; m / z (ESI+) found [M + H] + 100.0518, C 5 H 8 O 2 requires 100.0524; [α] D 23.6 +232 ( c 1.0, MeOH) [lit [α] D 27 +228.1 ( c 1.04, MeOH)].…”