نتایج جستجو برای: αβ unsaturated carbonyl compounds
تعداد نتایج: 252812 فیلتر نتایج به سال:
Multicomponent reactions were performed to develop novel α,β-unsaturated carbonyl depsipeptides and peptoids incorporating various chromophores such as cinnamic, coumarin, quinolines. Thus, through the Passerini Ugi multicomponent (P-3CR U-4CR), we obtained thirteen in moderate high yield following established protocol fundamentally varying electron-rich carboxylic acid reactants. UV/Vis spectr...
A chiral copper-hydride catalyst for the asymmetric conjugate reduction of alpha,beta-unsaturated carbonyl compounds has been used for the reduction of substrates containing beta-nitrogen substituents. A new set of reaction conditions has allowed for a variety of beta-azaheterocyclic acid derivatives to be synthesized in excellent yields and with high degrees of enantioselectivity. In addition,...
A remarkable α-effect of silicon has been discovered that results in soft nucleophilicity at the Cγ of 3,3-bis(silyl) allyloxy lithium 1. The addition of 1 to α,β-unsaturated carbonyl compounds, including enals, proceeds in a 1,4- over 1,2-manner with medium to good regioselectivity, whereas the parent allyloxy lithium 4 undergoes complete 1,2-addition. The results from DFT calculations of HMPA...
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