Quercus mongolica Fisch.(Fagaceae) is a deciduous tree growing in or near the forest gaps,mainly distributed in shandong,hebei,shanxi,inner Mongolia and northeast regions.Q.mongolica has been used to
The first asymmetric total synthesis ofhedyosumins A,B and C was accomplished in 13-14 steps from simple starting materiales.The key steps include an organocatalytic[4+3]cycloaddition reaction,an intr