The diastereoselective synthesis of sugar derived β-nitro nitriles through double asymmetric induction experiments involving Michael addition of formaldehyde SAMP- and RAMP-hydrazones [(S)-1 and (R)-1] to sugar nitroolefins 2 in excellent overall yields and high diastereoselective excesses is described. The absolute configuration of the RAMP-hydrazone 1,4-adduct 3c was determined by chemical correlation of its corresponding β-nitro nitrile 4c.
本文介绍了通过双不对称诱导实验,将
甲醛 SAMP- 和
RAMP-
肼[(S)-1 和 (R)-1]与糖硝基烯烃 2 迈克尔加成,非对映选择性地合成糖衍生的δ-硝基腈,总产率优异,非对映选择性过量率高。
RAMP- hydrazone 1,4-adduct 3c 的绝对构型是通过其相应的 δ-硝基腈 4c 的
化学相关性确定的。