Additions of Enantiopure α-Sulfinyl Carbanions to (<i>S</i>)-<i>N</i>-Sulfinimines: Asymmetric Synthesis of β-Amino Sulfoxides and β-Αmino Alcohols
作者:José L. García Ruano、Ana Alcudia、Miriam del Prado、David Barros、M. Carmen Maestro、Inmaculada Fernández
DOI:10.1021/jo9903858
日期:2000.5.1
Stereoselectivity can be achieved when the configurations at the sulfur atoms of the two reagents are opposite (matched pair), thus resulting in only one diastereoisomer, even for the case in which two new chiral centers are created. The N-sulfinyl group primarily controls the configuration of the carbon bonded to the nitrogen, whereas the configuration of the alpha-sulfinyl carbanion seems to be
将对(R)-和(S)-甲基和-乙基对甲苯基亚砜衍生的锂阴离子加到(S)-N-亚苄基-对甲苯亚磺酰胺中,提供了对映体纯的β-(N-亚磺酰基)氨基亚砜。当两种试剂的硫原子处的构型相反(匹配对)时,就可以实现立体选择性,因此即使在产生两个新的手性中心的情况下,也仅产生一个非对映异构体。N-亚磺酰基主要控制与氮键合的碳的构型,而α-亚磺酰基碳负离子的构型似乎负责不对称诱导的水平以及新的立体异构C-SO的构型碳与对甲苯基亚砜乙基反应。