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.
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.
Organosilicon compounds with functional groups proximate to silicon
作者:John J. Eisch、James E. Galle
DOI:10.1016/0022-328x(88)89085-5
日期:1988.3
(OEt)2PO and Ph; the groups R and R′ were H, Ph and n-C6H13; and the lithiating reagents were n-butyllithium, t-butyllithium and lithium diisopropylamide in donor media of THF or TMEDA. The lithiation occurs with retention of configuration and the resulting lithio-epoxide is unstable above 0°C, decomposing in a carbenoid manner. The lithiation is facile except for compounds where Z and R (an alkyl