Synthesis of (+)-siphonarienone: Asymmetric alkylation using a chiral benzopyrano-isoxazolidine auxiliary
作者:Atsushi Abiko、Satoru Masamune
DOI:10.1016/0040-4039(95)02353-4
日期:1996.2
Asymmetric alkylation of the potassium enolates derived from N-propionyl benzopyrano-[4,3-c]-isoxazolidine derivatives with chiral alkyl triflates proceeded smoothly with high diastereoselectivity. The stereochemistry of the newly formed stereogenic center was fully controlled by the facial selectivity of the enolate according to the rule of double asymmetric synthesis. The application of this methodology
N-丙酰基苯并吡喃基-[4,3-c]-异恶唑烷衍生物衍生的烯醇钾与手性烷基三氟甲磺酸酯的不对称烷基化以高非对映选择性顺利进行。根据双不对称合成的规则,新形成的立体异构中心的立体化学完全受烯醇化物的面部选择性控制。这种方法学的应用导致了海洋聚丙烯酸酯天然产物(+)-siphonarienoneone的首次合成。