A simple entry into 1,3-diols from (R)-2,3-cyclohexylideneglyceraldehyde: synthesis of (−)-galantinic acid
作者:Bhaskar Dhotare、Angshuman Chattopadhyay
DOI:10.1016/j.tetasy.2009.07.030
日期:2009.9
Aldehydes 5, 7, and 9 derived from easily accessible (R)-2,3-cyclohexylideneglyceraldehyde 1 were used as novel substrates to obtain both syn- and anti-1,3-diols in several individual reactions by subjecting each of them to some practically viable metal-mediated Barbier-type allylations under moist conditions. In this regard, a detailed investigation was made regarding the compatibility and stereoselectivity
醛5,7和9从容易获得(派生- [R)-2,3- cyclohexylideneglyceraldehyde 1被用作新底物,以获得这两个顺式和-抗由它们中的每经受一些在多个单独的反应-1,3-二醇在潮湿条件下几乎可行的金属介导的Barbier型烯丙基化。在这方面,对与这些醛5-7的四个这种金属介导的烯丙基化相关的相容性和立体选择性进行了详细的研究。。在几个成功的反应中具有良好的收率,具有适度的选择性,并且可以容易地色谱分离产物的非对映异构体,已成功地分离出两对对映体纯的syn -1,3和抗-1,3-二醇(6a和6b;10a和10b) )。最后,图10b已经被利用来合成( - ) - galantinic酸甲。