1-Bromo-1-chloroethane → 3-(2-Chloroethyl)-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione

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A mixture of 7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione (5, 22.2 mmol) and KOH (1.24 g, 22.2 mmol) in EtOH was refluxed for 10 min and bromochloroethane (6.35 g, 44.4 mmol) was added and refluxing continued for additional 6 h. Filtered and concentrated to get the crude chloroethylated product which was used as such for the next step (5.5 g). LCMS—[M+H] m/z 228.

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