A reaction of Grignard reagents with an optically pure N-sulfinylimine derived from methyl 2-formylbenzoate yields enantioenriched isoindolinones and tert-butyl sulfoxides. The products are formed by the addition of the nucleophile to N-sulfinylimine followed by cyclization to form N-tert-butylsulfinylisoindolinone, which readily undergoes substitution with a second equivalent of Grignard reagent.
格氏试剂与衍生自2-甲酰基
苯甲酸甲酯的光学纯的N-亚磺
酰亚胺反应,得到对映体富集的
异吲哚啉酮和叔
丁基亚砜。该产品通过加入亲核试剂,以形成Ñ -sulfinylimine随后环化,以形成ñ -叔-butylsulfinylisoindolinone,这容易经历取代与
格氏试剂的第二等效。该反应可以在
二氯甲烷中在室温或升高的温度下进行,而没有任何立体选择性的损失。还研究了
格氏试剂以外的亲核试剂的使用。