Regioselective addition of trimethylstannylcopper–dimethyl sulphide to 1-alkynes: synthesis of ω-substituted 2-(trimethylstannyl)-1-alkenes

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Abstract
Treatment of ω-substituted 1-alkynes (2) with 2 equiv. of trimethylstannylcopper–dimethyl sulphide (1) in tetrahydrofuran (–63 ° C)in the presence of 60 equiv. of methanol affords good to excellent yields of the corresponding 2-(trimethylstannyl)-1-alkenes (3).