Highly stereospecific SN2-type displacement of sulfinyl by hydroxy group under pummerer conditions
作者:Pierfrancesco Bravo、Matteo Zanda、Carmela Zappalà
DOI:10.1016/0040-4039(96)01260-9
日期:1996.8
The trifluoroacetic anhydride promoted Pummerer reactions of N-Cbz α-amino-α-trifluoromethyl-β-p-tolylsulfinyl methyl butanoates 1b-c occur in a highly stereospecific non-oxidative fashion (d.r. > 98:2), resulting in a SN2-type displacement of the sulfinyl by hydroxy group and providing enantiomerically pure α-trifluoromethyl-allo-threonine 2b and -threonine 2c derivatives.
三氟乙酸酐促进的N -Cbzα-氨基-α-三氟甲基-β-对甲苯亚磺酰基甲基丁酸酯1b-c的Pummerer反应以高度立体定向的非氧化方式发生(dr> 98:2),导致S N通过羟基和提供对映体纯α三氟甲基-亚磺酰基的2型位移同种异体-苏氨酸图2b和苏氨酸2c的衍生物。