Electrophilic amination of diorganozinc reagents by oxaziridines
作者:Mohammed Ghoraf、Joëlle Vidal
DOI:10.1016/j.tetlet.2008.10.049
日期:2008.12
amination of organozincreagents by oxaziridines has been studied. Diorganozinc reagents R2Zn (R = alkyl or aryl) react with N-Boc oxaziridine to afford N-Boc protected primary amines BocNHR in moderate to good yields. No additives are needed in this reaction, which proceeds at 0 °C. We suggest that the presence of two heteroatoms in oxaziridine allows Lewis baseactivation of the diorganozinc reagent.
S<sub>N</sub>2′-Regio- and Diastereoselective Allylation of Organozinc Reagents
作者:Masayuki Arai、Takashi Kawasuji、Eiichi Nakamura
DOI:10.1246/cl.1993.357
日期:1993.2
Dialkylzinc reagents, R2Zn and R2Zn·LiCl, undergo an SN2′-regio- and diastereoselective allylation reaction with substituted allylic chlorides and phosphates in the presence of a coordinating additive.
The stereoselective synthesis of biologically important vinylglycine derivatives by reaction of homochiral 4-methoxycarbonyl-5-vinyloxazolidin-2-ones with organocopper reagents is described; 4,5-trans-oxazolidin-2-one 6 yields (E)-vinylglycines as the major products by treatment with the âhigher orderâ cyanocuprateâBF3 reagents or trialkylzincates in the presence of cuprous cyanide, 4,5-cis-oxazolidin-2-one 10 affords only the desired (E)-vinylglycines.