Reaction Steps
To a solution of CH2Cl2 (50 mL) and H2O (5 mL) under air was added the diacylglycerol [7] (3.12 g, 4.00 mmol). DDQ (1.81 g, 8.00 mmol) was added and the reaction was stirred overnight at room temperature. The reaction was diluted with CH2Cl2 (50 mL) and washed with saturated NaHCO3 solution (20 mL), brine (20 mL) and dried over MgSO4. Flash chromatography eluting with 40-50% EtOAc in hexane gave the alcohol [8] (2.40 g, 3.62 mmol, 91%) as an off white solid: (Found: C, 70.7; H, 10.1; N, 2.1. C39H67O7N requires C, 70.7; H, 10.2; N, 2.1%); m.p. 56-58° C. [α]D20=−3.2 (c 1.02 in CHCl3); Rf=0.20 (30% EtOAc/hexane); γmax(CHCl3)/cm−1 3450, 2924, 2854, 1724, 1602, 1517, 1465, 1413, 1372, 1251, 1164; δH (400 MHz; CDCl3) 7.34-7.25 (5 H, m, Bn), 5.10-5.05 (3 H, m, CH2CHCH2, OCH2C6H5), 4.81 (1 H, bs, NH), 4.31 (1 H, dd, J 11.9, 4.4, CH2CHCH2), 4.20 (1 H, dd, J 11.9, 5.8, CH2CHCH2), 3.71 (2 H, d, J 5.8, CH2CHCH2), 3.16 (2 H, q, J 6.6, CH2NH), 2.32 (2 H, t, J 7.5, OCOCH2), 2.30 (2 H, t, J 7.8, OCOCH2), 1.63-1.59 (4 H, m, OCOCH2CH2, CH2CH2NH), 1.58-1.45 (2 H, m, CH2CH2CH2NH), 1.25 (36 H, bs, COC15H31, C11H22NH), 0.87 (3 H, t, J 6.6, CH2CH3); δC (63.5 MHz; CDCl3) 173.7, 173.4 (OCO), 156.4 (NHCO), 136.7, 128.5, 128.0, 112.6 (4×Bn), 72.1 (CH), 66.6, 62.1, 61.4 (3×CH2), 41.1 (NHCH2), 34.3, 34.1, 31.9, 30.0, 29.7, 29.6, 29.5, 29.3, 29.2, 29.1, 26.7, 24.9, 22.7 (12×CH2), 14.1 (CH3); m/z (CI) [Found (M+Na)+ 684.4828. C39H67O7NNa requires M, 684.4816].
