Oxiranyllithium reagents: Generation from organotin precursors, addition to aldehydes and ketones, and dimerization to α,α′-dialkoxyolefins
摘要:
Oxiranyllithium compounds can be generated from organotin precursors by tin-lithium exchange with butyllithium in THF at -90-degrees-C. In the presence of TMEDA, they react with aldehydes and ketones to give epoxy alcohols in good yields. In the absence of TMEDA, they dimerize to alpha,alpha'-dialkoxyolefins.