Chiral Sensor for Enantiodiscrimination of Varied Acids
作者:Huayin Huang、Guangling Bian、Hua Zong、Yabai Wang、Shiwei Yang、Huifeng Yue、Ling Song、Hongjun Fan
DOI:10.1021/acs.orglett.6b00088
日期:2016.6.3
A chiral thiophosphoroamide 4 derived from (1R,2R)-1,2-diaminocyclohexane is used as a highly effective chiralsensor for the chiral recognition of varied acids via ion-pairing and hydrogen-bonding interactions using 1H, 19F and 31P NMR.
衍生自(1 R,2 R)-1,2-二氨基环己烷的手性硫代磷酰胺4用作高效的手性传感器,通过使用1 H,19 F和19 H的离子对和氢键相互作用手性识别各种酸31 P NMR。
作者:Jørn E. Tungen、Jens M. J. Nolsøe、Trond V. Hansen
DOI:10.1021/ol302798g
日期:2012.12.7
Asymmetric iodolactonization of gamma- and delta-unsaturated carboxylic acids has been explored in the presence of six different chiral organocatalysts 5-8. The catalyst 6b was found to facilitate the cyclization of 5-arylhex-5-enoic acids 1 to the corresponding iodolactones 2 with up to 96% ee. By this protocol, unsaturated carboxylic acids are converted enantioselectively to synthetically useful delta-lactones in high yields using commercially available NIS. Apparently, both hydrogen bonding and aryl/aryl interactions are important for efficient stereodifferentiation.