Revision of the Absolute Configurations of Bethosides B and C and Their Aglycone
作者:Victoria L. Challinor、Patricia Y. Hayes、Paul V. Bernhardt、William Kitching、Reginald P. Lehmann、James J. De Voss
DOI:10.1021/jo2012797
日期:2011.9.2
The absolute stereochemistry of the steroidal saponins bethosides B and C was previously assigned as (22R,25R) on the basis of work that employed Horeau’s method. Our studies of helosides A and B created doubt about both the original assignment and consequently our conclusion that relied upon it. The absoluteconfigurations of bethosides B and C are revised to (22S,25R) following X-ray crystallographic