A Simple and Efficient Highly Enantioselective Synthesis of α-Ionone and α-Damascone
作者:Marcella Bovolenta、Francesca Castronovo、Alessandro Vadalà、Giuseppe Zanoni、Giovanni Vidari
DOI:10.1021/jo049012j
日期:2004.12.1
(ee ≥99%) synthesis of α-ionone and α-damascone is described. Both enantiomers of title compounds were synthesized through two straightforward pathways diverging from enantiopure (R)- or (S)-α-cyclogeraniol. These versatile building blocks were obtained by regioselective ZrCl4-promoted biomimetic cyclization of (6S)- or (6R)-(Z)-6,7-epoxygeraniol, respectively, followed by deoxygenation of the so formed
描述了高效的高对映选择性(ee≥99%)的α-紫罗兰酮和α-大马康酮合成。标题化合物的两种对映异构体均通过与对映纯(R)-或(S)-α-环香叶醇不同的两个直接途径合成。这些通用的结构单元是通过区域选择性ZrCl 4促进的(6 S)-或(6 R)-(Z)-6,7-环氧香叶醇的仿生环化,然后将如此形成的仲醇脱氧而获得的。手性信息是由廉价的香叶基乙酸酯的高度区域选择性的Sharpless不对称二羟基化编码的。