“…The mixture was stirred at 60 °C for 1 h. After cooling the mixture was concentrated and purified by chromatography over silica gel eluting with cyclohexane:AcOEt 5 : 1 to give the tittle compound (32 mg, quantitative) as a colorless oil. 1 H NMR (300 MHz, CDCl 3 ) δ 4.34-4.06 (m, 6H, OCH 2 CH 3 , H-2), 2.86 (dq, J = 16.8 Hz, 1.5 Hz, 1H, H-4), 2.72 (dq, J = 16.8 Hz, 1.4 Hz, 1H, H-4), 2.21 (s, 3H, COCH 3 ), 2.18 (t, J = 1.5 Hz, 3H, C6-CH 3 ), 1.28 (t, J = 7.2 Hz, 3H, OCH 2 CH 3 ), 1.25 (t, J = 7.2 Hz, 3H, OCH 2 CH 3 ); 13…”