The pure crystalline diastereomers (1R,2S,5R)-menthyl (R)- and (S)-2-methoxynaphthalene-1-sulfinate (1b) have been prepared and, by reaction with Grignard reagents (the Andersen procedure), converted into optically active alkyl and aryl 2-methoxynaphthyl sulfoxides in 67-77% yields. Use of an excess of Grignard reagent results in facile O-alkyl cleavage of the methoxy group to the corresponding naphthol or a competing loss of the alkyl- or aryl- sulfinyl group to form 2-methoxynaphthalene. Pure diastereomers of menthyl 2,7- dimethoxynaphthalene-1-sulfinate (2b) and menthyl 4-methoxynaphthalene-1-sulfinate (3b) have also been prepared and their reactions with Grignard reagents have been studied.
纯结晶非对映异构体(1R,2S,5R)-(R)-和(S)-2-甲氧基
萘-1-亚磺酸甲酯(1b)已经制备完成,并通过与
格氏试剂反应(安徒生程序),以 67-77% 的产率转化为具有光学活性的烷基和芳基 2-甲氧基
萘硫醚。使用过量的
格氏试剂可使甲氧基的 O-烷基迅速裂解成相应的
萘酚,或使烷基或芳基的亚砜基竞争性脱落,形成 2-甲氧基
萘。此外,还制备了
2,7-二甲氧基萘-1-亚
磺酸薄荷酯(2b)和 4-甲氧基
萘-1-亚磺酸薄荷酯(3b)的纯非对映体,并研究了它们与
格氏试剂的反应。