Stereochemistry of 1,5-Benzothiazepin-4-one <i>S</i>-Oxide: Insight into the Stereogenic Elements at the Sulfur Atom and Axis
作者:Hidetsugu Tabata、Tetsuya Yoneda、Tetsuta Oshitari、Hideyo Takahashi、Hideaki Natsugari
DOI:10.1021/jo401020y
日期:2013.6.21
Oxidation of 1,5-benzothiazepin-4-one (5-A) stereoselectively afforded the S-oxide 8I-A (aS,1S) in preference to the diastereomer 8II-A (aS,1R) affected by the remote stereogenic axis. All the enantiomers (8I-A/8I-B and 8II-A/8II-B) were separated and isolated, and the interconversion between 8I and 8II (equilibrium ratio ≈5:1) was unequivocally verified to be caused by the rotation around the axis
氧化1,5-苯并噻唑-4-(5 - A)立体选择性地提供了S-氧化物8I - A(a S,1 S),优先受非对映体8II - A(a S,1 R)影响。远程立体轴。分离并分离出所有对映体(8I - A / 8I - B和8II - A / 8II - B),以及8I和8II之间的相互转化。 (平衡比≈5:1)明确地证实是由围绕轴的旋转引起的。