Improved synthesis of 2-deoxy-2-fluoro-D-glucose using fluoride ion.
作者:TERUSHI HARADAHIRA、MINORU MAEDA、YASUNOBU KAI、HIROKO OMAE、MASAHARU KOJIMA
DOI:10.1248/cpb.33.165
日期:——
Methyl 3-O-benzyl-4, 6-O-benzylidene-2-O-(trifluoromethanesulfonyl)-β-D-mannopyranoside (7) was examined as a substrate for the preparation of 2-deoxy-2-fluoro-D-glucose (1) by fluoride ion treatment. The triflate (7) reacted rapidly with tetraalkylammonium fluorides in acetonitrile or tetrahydrofuran to give methyl 3-O-benzyl-4, 6-O-benzylidene-2-deoxy-2-fluoro-β-D-glucopyranoside (10) in 52-57% yield. Removal of the protecting groups from 10 by the use of 50% methanesulfonic acid afforded the required 1 in good yield. This synthetic sequence may provide an effective alternative to known methods for preparing 18F-labeled 1.
研究人员将 3-O-苄基-4,6-O-亚苄基-2-O-(三氟甲磺酰基)-β-D-吡喃甘露糖苷(7)作为底物,通过氟离子处理制备 2-脱氧-2-氟-D-葡萄糖(1)。三酸酯(7)与四烷基氟化铵在乙腈或四氢呋喃中迅速反应,得到甲基 3-O-苄基-4,6-O-亚苄基-2-脱氧-2-氟-β-D-吡喃葡萄糖苷(10),收率为 52-57%。用 50%的甲磺酸去除 10 中的保护基团,可以得到所需的 1,收率很高。这种合成方法可以有效替代已知的 18F 标记 1 的制备方法。