作者:Laura J. Marshall、Karl M. Cable、Nigel P. Botting
DOI:10.1039/b813991a
日期:——
An efficient and high-yielding synthesis for [1,3,5-13C3]gallic acid from non-aromatic precursors is presented. [3,5-13C2]4H-Pyran-4-one was first prepared from the reaction between triethyl orthoformate and [1,3-13C2]acetone. The third 13C-atom was introduced into the ring by reaction of the pyranone with diethyl [2-13C]malonate. The resulting ethyl 4-hydroxy-[1,3,5-13C3]benzoate was brominated in
提出了一种由非芳香族前体有效合成高产率的[1,3,5- 13 C 3 ]没食子酸的方法。[3,5- 13 C 2 ] 4 H -Pyran-4-one首先由原甲酸三乙酯和[1,3- 13 C 2 ]丙酮。通过吡喃酮与[2- 13 C]丙二酸二乙酯反应,将第三个13 C-原子引入环中。将得到的4-羟基- [1,3,5- 13 Ç 3 ]苯甲酸甲酯在3-和5-位被溴化,得到乙基3,5-二溴-4-羟基- [1,3,5- 13 C 3 ]苯甲酸酯。在碱性条件下,一步一步就可完成酯的水解和溴原子被羟基的取代,从而得到所需的[1,3,5- 13 C 3 ]没食子酸。[2,6- 13 C 2 ] 4 H的合成还展示了-pyran-4-one的方法,以证明该方法可将13个C原子区域选择性地置入苯环中。