作者:Xiaolei Wang、Jie Zheng、Qiang Chen、Huaiji Zheng、Yongping He、Juan Yang、Xuegong She
DOI:10.1021/jo101016g
日期:2010.8.6
A concise, biomimetictotalsynthesis of the unprecedented terpenoid skeleton (+)-chabraol has been accomplished via 6 steps from the chiral epoxide 7, involving an intramolecular Prins double cyclization to yield the bicyclo[2.2.1] core of the natural product as the key step. The absolute configuration of natural chabranol was also designated through the first asymmetrictotalsynthesis.
Enantioselective Synthesis of (−)-(<i>R</i>)-Cordiachromene and (−)-(<i>R</i>)-Dictyochromenol Utilizing Intramolecular<i>S</i><sub>N</sub>Ar Reaction
作者:Yoshihiro Noda、Misato Yasuda
DOI:10.1002/hlca.201200312
日期:2012.10
A simple and efficient enantioselectivesynthesis of chromene, (−)‐(R)‐cordiachromene (1), and (−)‐(R)‐dictyochromenol (2) has been accomplished. This convergent synthesisutilizes intramolecular SNAr reaction for the formation of chroman ring, and Seebach's method of ‘self‐reproduction of chirality’ should establish the (R)‐configuration of the C(2) side chain as key steps.
一个简单而有效的对苯二酚,(-)-(R)-cordiachromene(1)和(-)-(R)-dictyochromenol(2)的对映选择性合成已经完成。这种聚合合成利用分子内的S N Ar反应形成苯并二氢吡喃环,Seebach的“手性自我复制”方法应将C(2)侧链的(R)-构型确立为关键步骤。