Precursors to oak lactone: synthesis of gallate ester derivatives of 3-methyl-4-hydroxyoctanoic acid
作者:Michael Raunkjær、D.Sejer Pedersen、Gordon M. Elsey、Mark A. Sefton、George K. Skouroumounis
DOI:10.1016/s0040-4039(01)01890-1
日期:2001.12
(3R,4R- and 3S,4S)-3-Methyl-4-(3′-O-methylgalloyloxy)octanoic acid (2b), the corresponding methyl ester (2c) and the straight galloyl derivative, (3R,4R- and 3S,4S)-3-methyl-4-galloyloxyoctanoic acid (2a) were synthesised from cis-oak lactone (1). Analysis by TLC and mass spectrometry established that the original assignment of structure (2c) to a methylated natural oak component was in error.
(3 R,4 R-和3 S,4 S)-3-甲基-4-(3'- O-甲基galloyloxy)辛酸(2b),相应的甲酯(2c)和直式没食子酰基衍生物,(3 [R,4 - [R -和3小号,4小号)-3-甲基-4- galloyloxyoctanoic酸(图2a),从合成的顺式-oak内酯(1)。通过TLC和质谱分析确定,结构(2c)最初分配给甲基化天然橡木组分是错误的。