4-Chloroaniline (1.44 g) was added to a solution of the product from step (i) (0.88 g) and N,N-diisopropylethylamine (0.484 g) in 1,4-dioxane (15 ml) and isopropylalcohol (15 ml) and the mixture heated at 110° C. for 6 days. The mixture was partitioned between ethyl acetate and water, the organics dried (MgSO4), and evaporated under reduced pressure. The solid was triturated with ethyl acetate, filtered and the filtrate purified by chromatography on silica eluting with 3% ethyl acetate in toluene. Yield 0.28 g
