Two brassinolide analogues,(2)and(3),have been synthesized from hyodeoxycholic acid(4)through a sequence of reactions as shown in Scheme 1 and 2 of the text.
The influence of ligands on the palladium catalyzed reaction of allylic-1,1-diol diacetate(1) with sodium dimethyl malonate was studied. When PPh_3 was used as