A Convenient Stereoselective Synthesis of (1<i>R</i>,2<i>S</i>,3<i>R</i>,4<i>S</i>)-3-(Neopentyloxy)isoborneol
作者:Xavier Verdaguer、Iolanda Marchueta、Jordi Tormo、Albert Moyano、Miquel A. Pericàs、Antoni Riera
DOI:10.1002/hlca.19980810109
日期:1998.1.12
A convenient preparation of (1R,2S,3R,4S)-3-(neopentyloxy)isoborneol (= (1R,2S,3R,4S)-3-(2,2-dimethyl-propoxy)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol; 1a), a valuable chiral auxiliary, is described. The synthesis involves six steps starting from the readily available camphorquinone (5) and gives 1a in 48% overall yield. The key step is the chemoselective hydrolysis of the less hindered 1,3-dioxolane
方便制备(1 R,2 S,3 R,4 S)-3-(新戊氧基)异冰片醇(=(1 R,2 S,3 R,4 S)-3-(2,2-二甲基丙氧基)-1,7,7-三甲基双环[2.2.1]庚-2-醇;1a),一种有价值的手性助剂。从容易获得的樟脑醌(5)开始,合成过程涉及六个步骤,总产率为48%的1a。关键步骤是樟脑醌二缩醛4中受阻较少的1,3-二氧戊环部分的化学选择性水解。