Total Syntheses and Anti-inflammatory Evaluations of Pongamosides A-C, Natural Furanoflavonoid Glucosides from Fruit of (L.) Pierre.

The syntheses of three natural furanoflavonoid glucosides, including two flavone glucosides, pongamosides A () and B (), and a flavonol glucoside, pongamoside C (), were achieved for the first time in 9-15 steps from commercially available materials in overall yields ranging from 2.9% to 29%. The synthetic sequence featured a NaH-promoted BK-VK rearrangement and acid-catalyzed intramolecular cyclization to furnish the furanoflavonoid aglycone.

The characteristic of extrapolation in numerical inductive inference: an ERP study.

Event-related brain potentials (ERPs) were recorded to study the characteristic of extrapolation in the number series completion task. Subjects were asked to judge whether the test number was following the number series according to the rule acquired from the prior three numbers presented. For Congruent Condition, the test number was the right answer which followed the prior three numbers with a rule (such as "+4").