[CH3:1][C@H:2]([CH2:19][CH2:20][CH:21]=[C:22]([CH3:24])[CH3:23])[CH2:3][CH2:4][CH2:5]N1C(=O)C2N(C)C=NC=2N(C)C1=O.[Mg].II.C(Br)C[C@@H](CCC=C(C)C)C.C=[O:40].[Cl-].[NH4+]>O1CCCC1>[CH3:1][C@H:2]([CH2:19][CH2:20][CH:21]=[C:22]([CH3:24])[CH3:23])[CH2:3][CH2:4][CH2:5][OH:40]This example illustrates the synthesis of 1-(4-(R)-Methyl-8-methylnon-7-enyl)-3,7-dimethylxanthine (CT2536R). To a suspension of magnesium (2.74 g, 140 mmol) and a crystal of iodine in tetrahydrofuran (15 ml) was added (R)-citronellyl bromide (5.0 g, 22.8 mmol) in tetrahydrofuran (10 ml) over 30 min and the reaction stirred for a further 30 min after the addition was complete. The solution was added via a canula over 5 min to a suspension of paraformaldehyde (1.80 g, 60.0 mmol) in tetrahydrofuran (15 ml) and stirred at 25° C. for 6 hr. Saturated ammonium chloride (40 ml) was added and extracted with diethyl ether (2×30 ml). The combined organic extracts were dried (magnesium sulfate) and evaporated to give 4-(R)-methyl-8-methylnon-7-enyl alcohol as a clear liquid (3.25 g, 84%).
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