Synthesis of 2-Substituted (±)-(2<i>R,</i>3<i>R,</i>5<i>R</i>)-Tetrahydrofuran-3,5-dicarboxylic Acid Derivatives
作者:Gary T. Wang、Sheldon Wang、Yuanwei Chen、Robert Gentles、Thomas Sowin
DOI:10.1021/jo001551a
日期:2001.3.1
of 2-substituted (+/-)-(2R,3R,5R)-tetrahydrofuran-3,5-dicarboxylic acidderivatives has been developed. Starting from 5-norborne-2-ol, the key intermediate (+/-)-methyl 5,6-exo,exo-(isopropylidenedioxy)-2-oxabicyclo[2.2.1]heptane-3-exo-carboxylate (15) was synthesized in an efficient six-step sequence. The key transformation is the base-catalyzed methanolysis-rearrangement of (+/-)-6,7-exo,exo-(isop