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Beilstein J. Org. Chem. 2015, 11, 1220–1225, doi:10.3762/bjoc.11.135
Graphical Abstract
Figure 1: Structures of icariin (1), icariside I (2) and icaritin (3).
Scheme 1: Reagents and conditions: (a) Ac2O, pyridine, 94%; (b) BnBr, KI, K2CO3, acetone, 85%; (c) Me2SO4, K2...
Scheme 2: Decomposition of 8.
Scheme 3: Claisen rearrangement of flavonol 8.
Scheme 4: Reagents and conditions: (a) 15, DMF/CHCl3, Ag2CO3, molecular sieves (4 Å, powder); (b) 16, CH2Cl2,...
Beilstein J. Org. Chem. 2015, 11, 288–293, doi:10.3762/bjoc.11.33
Figure 1: Kaempferol.
Scheme 1: Reagents and conditions: (a) PhSH, imidazole, NMP (N-methylpyrrolidinone), 0 °C, 91%; (b) Me2SO4 (1...
Scheme 2: Reagents and conditions: (a) BnBr (1.9 equiv), KI, K2CO3, acetone, 85%; (b) i: AlCl3, CH2Cl2, CH3CN...
Scheme 3: Reagents and conditions: (a) NH3 (g), MeOH, 95%; (b) Me2SO4 (2.6 equiv), K2CO3, acetone, rt, 87%; (...