General Procedure G. To a solution of alcohol (1.0 eq.) is dissolved in anhydrous DCM (4.9 mL/mmol) was added DIPEA (3.0 eq.) before flushing the flask with N2 and cooling to 0°C. MsCl (3.0 eq.) was then added dropwise, and the reaction was left to stir at 0°C for 20 min before warming to r.t. and stirring for 2 h. The reaction mixture was concentrated in vacuo. The residue was then purified by flash column chromatography using a linear gradient from 0% to 100% EtOAc in heptane to yield mesylates as orange/red oils.