Asymmetric diastereoselective syntheses of the aphid insect pigment derivatives quinone A and quinone A′
作者:Robin G.F Giles、Ivan R Green、Francois J Oosthuizen、C.Peter Taylor
DOI:10.1016/s0040-4039(01)00955-8
日期:2001.8
has been used to provide the chiral source for the asymmetric diastereoselective syntheses of all four stereoisomers of 3,4-dihydro-4,7,9-trihydroxy-1,3-dimethylnaphtho[2,3-c]pyran-5,10-quinone based on 3R stereochemistry. The (1R,3R,4S) and (1R,3R,4R) stereoisomers were identical with the natural derivatives of the aphid insect pigments quinone A and quinone A′, while the (1S,3R,4S) and (1S,3R,4R)
可商购的(R)-乳酸酯已用于为3,4-二氢-4,7,9-三羟基-1,3-二甲基萘[2,3- c]的所有四个立体异构体的不对称非对映选择性合成提供手性来源基于3 R立体化学的] pyran-5,10-醌。(1 R,3 R,4 S)和(1 R,3 R,4 R)立体异构体与蚜虫昆虫色素醌A和醌A'的天然衍生物相同,而(1 S,3 R, 4 S)和(1 S,3 R,4 R)立体异构体被发现是迄今未报道的来自替代蚜虫昆虫来源的两种天然来源的醌的对映异构体。关键步骤是四异丙氧基钛诱导的间-羟基苄基保护的乳醛的分子内非对映选择性环化,得到苯并[ c ]吡喃-4,5-二醇。