Synthesis via vinyl sulfones. 27. Total synthesis of cephalotaxine. The first example of an intramolecular [4 + 2] cycloaddition where the dienophile has been delivered from the face opposite to the tethering moiety
Synthesis via vinyl sulfones. 27. Total synthesis of cephalotaxine. The first example of an intramolecular [4 + 2] cycloaddition where the dienophile has been delivered from the face opposite to the tethering moiety