Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The preparation of the bottom half of ivermectin 3 in 10 steps and 9% overall yield is reported. ... Synthesis of a synthon for the bottom half of ivermectin with all the required functionality in the correct oxidation states, namely compounds 3, has been synthesized from 4 and 5 ...