The sulfonyl carbanion derived from 2,3-dihydro-1-benzothiophene-1,1-dioxide and its lithium salt has been investigated by DFT calculations. NMR and IR spectroscopic analyses showed that the lithium sulfonyl carbanion exists in solution as a monomer in equilibrium with a dimer. The lithium carbanion was treated with aldehydes and azomethynes to give chiral hydroxy and amino derivatives. The stereochemistry of the products and the diastereoselectivity of the reaction were investigated.

中文翻译：

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2,3-二氢-1-苯并噻吩-1,1-二氧化锂：合成，表征，DFT计算以及对醛和偶氮甲碱的反应性

已经通过DFT计算研究了由2，3-二氢-1-苯并噻吩-1，1-二氧化物衍生的磺酰基碳负离子。NMR和IR光谱分析表明，磺酰锂锂以与二聚体平衡的单体形式存在于溶液中。用醛和偶氮二炔处理碳负离子锂，得到手性羟基和氨基衍生物。研究了产物的立体化学和反应的非对映选择性。