Asymmetric Synthesis of Aminocyclopropanes and<i>N</i>-Cyclopropylamino Alcohols Through Direct Amidocyclopropanation of Alkenes Using Chiral Organozinc Carbenoids
作者:Guillaume Bégis、David E. Cladingboel、Laure Jerome、William B. Motherwell、Tom D. Sheppard
DOI:10.1002/ejoc.200801033
日期:2009.4
Chiral N-(diethoxymethyl)oxazolidinones, prepared from the corresponding oxazolidinones by heating in triethyl orthoformate can he used as organozinccarbenoid precursors for the direct enantioselective amidocyclopropanation of alkenes. The reaction is successful with it wide range of oxazolidinones and alkenes and proceeds with moderate to excellent, yield and stereoselectivity. In most cases the
Ruthenium-Catalyzed [2 + 2] Cycloadditions of Ynamides
作者:Nicole Riddell、Karine Villeneuve、William Tam
DOI:10.1021/ol0512841
日期:2005.8.1
[GRAPHICS]Ruthenium-catalyzed [2 + 2] cycloadditions between norbornene and ynamides were investigated. The ynamide moiety was found to be compatible with the ruthenium-catalyzed cycloaddition conditions, giving the corresponding cyclobutene cycloadducts in moderate to good yields (up to 97%).
Katsumura; Iwama; Inagaki, Russian Journal of Organic Chemistry, 1996, vol. 32, # 2, p. 225 - 229