Tributylstannane → 5-[[3,5-Bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-3-[2-(acetyloxy)ethyl]-4-thiazolidinone

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Reaction Steps

Under a nitrogen atmosphere, 82.2 g of 5-{[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene}-3-[2-(acetyloxy)ethyl]-2-thioxo-4-thiazolidinone in 950 ml of toluene was heated to 65° C. Tri-n-butyl tin hydride (219.7 g) and AIBN (4.65 g) were added and the solution heated at reflux temperature for an additional 10 minutes. After cooling, the mixture was washed with 1.25 l of 1N hydrochloric acid followed by 500 ml of a saturated sodium chloride solution. The organic layer was stripped and allowed to stand overnight, during which time a precipitate separated. The liquid portion was decanted off, and the resulting residue was purified by chromatography over silica gel, eluting with a gradient of 25-50% of ethyl acetate in hexane. The appropriate fractions were combined and concentrated in vacuo to provide 45.7 g of the desired titled compound, m.p.=152°-155° C.

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