Synthetic routes for analogs 401, 402, 403, 404, and 406. Reagents and conditions: (a) methyl phenyl sulfoxide, LDA/THF; (b) triphenylphosphine, NBS/CH2Cl2; (c) K2CO3/DMF; (d) DIBAL-H/THF; (e) trifluoroacetic acid/CH2Cl2; (f) phenylacetyl chloride, NaHCO3/CH2Cl2.