la 103 [0173] Referring to Reaction Scheme 1, Step 1, an excess, and preferably about 2.2 equivalents of lithium bis(trimethylsilyl)amide in a nonpolar, aprotic solvent such as THF is added slowly via syringe to a ???78??? C. solution of a compound of Formula 101, wherein PG is a protecting group and more preferably, is a Boc group, in a nonpolar, aprotic solvent such as THF. The reaction solution