n organometallic reagent is then added to give the diol VI. The benzylic alcohol of VI is then reacted with the thiol IX by: (1) making the chloride by reaction with methanesulfonyl chloride in the presence of triethylamine, and (2) substituting the chloride by the thiol IX in the presence of a base such as sodium hydride or cesium carbonate to afford VII. In the cases where Q1 is an ester, hydrol