Silyl-cupration of an acetylene followed by ring-formation
摘要:
The acetylenes 1a-e undergo silyl-cupration followed by cyclisation, the acetylenes 1f-1h react with the silyl-cuprate reagent more rapidly at the alternative electrophilic site, and the acetylenes 1i, 1j and 21 give relatively low yields of cyclic products amongst others. Ring-formation is, unusually, a not particularly favourable pathway.