Diastereoselective route to (2R,5S)- and (2S,5S)-2-methyl-1,6-dioxaspiro[4.5]decane, a pheromone component of the wasp Paravespula vulgaris
作者:Paulo H.G. Zarbin、Alfredo R.M. de Oliveira、Carlos E. Delay
DOI:10.1016/s0040-4039(03)01716-7
日期:2003.9
A diastereoselective approach to (2R,5S)- and (2S,5S)-2-methyl-1,6-dioxaspiro[4.5]decane 1 and 1a is described. The route starts with an alkylation reaction among the cyclopentanone N,N-dimethylhydrazone 6 and the chiral iodides (R)-3 or (S)-3, derived from the enantiomers of ethyl β-hydroxybutyrate, controlling the estereocenter at C-2 of the molecules. The alkylated products 7 and 7a were easily
描述了对(2 R,5 S)-和(2 S,5 S)-2-甲基-1,6-二氧杂螺[4.5]癸烷1和1a的非对映选择性方法。该路线以环戊酮N,N-二甲基hydr 6与手性碘化物(R)-3或(S)-3之间的烷基化反应开始,该碘化物来自β-羟基丁酸乙酯的对映异构体,控制酯中心在C-2处。分子。烷基化产物7和7a容易转化为1,8- O-TBS-1,8-二羟基-5-壬酸9和9a分四个步骤,随后在酸性介质中进行立体选择性螺酮缩合,得到化合物1和1a的Z:E混合物(1:2)。