Catalytic and asymmetric [2,3]sigmatropic rearrangement: Co(III)-salen catalyzed S-ylide formation from allyl aryl sulfides and their rearrangement
作者:Tsutomu Fukuda、Ryo Irie、Tsutomu Katsuki
DOI:10.1016/s0040-4020(98)01065-5
日期:1999.1
Co(III)-salen complex (8-Br) provided 3-substituted 2-arylthio-4-pentenoic acid esters stereoselectively by way of enantioselective S-ylide formation and subsequent diastereoselective [2,3]sigmatropic rearrangement. For example, the reaction of cinnamyl phenyl sulfide and (−)-menthyl α-diazoacetate provided (−)-menthyl (2R,3S)-2-phenylthio-3-phenyl-4-pentenoate of 74% de preferentially.
烯丙基芳基硫醚和α-重氮乙酸酯在光学活性Co(III)-salen配合物(8-Br)存在下的反应通过对映选择性S-内酯立体选择性地提供了3-取代的2-芳硫基-4-戊烯酸酯形成和随后的非对映选择性的[2,3]σ向右重排。例如,肉桂基苯基硫化物与(-)-薄荷基α-重氮乙酸酯的反应优先提供了74%的(-)-薄荷基(2 R,3 S)-2-苯基硫基-3-苯基-4-戊烯酸酯。