Rhodium-Catalyzed Asymmetric Hydrogenation of β-Acetylamino Acrylosulfones: A Practical Approach to Chiral β-Amido Sulfones
摘要:
The efficient and highly enantioselective catalytic asymmetric hydrogenation of beta-acetylamino acrylosulfone has been achieved by employing Rhodium-TangPhos as catalyst. A series of beta-amido sulfone products are obtained with excellent yields and good enantioselectivities.
Nucleophilic behaviour of 1-substituted morpholino ethenes
作者:R.A. Ferri、G. Pitacco、E. Valentin
DOI:10.1016/0040-4020(78)88384-7
日期:1978.1
Morpholinoenamines derived from cyclohexyl-, cyclohexen-1-yl-, and phenyl methyl ketone react with diethyl azodicarboxylate (DAD) and phenylisocyanate (PIC) in a similar manner. Some difference in behaviour is observed in their reactions with mesyl chloride (MsCl), whereas a completely different reactivity is shown with β-nitrostyrene (βNS). An example of catalysed reversible transformation thietane
The nickel/(S)-Binapine complex was found to be an efficient catalyst for asymmetric hydrogenation of β-acetylamino vinylsulfones to afford chiral β-Amido sulfones with excellent yields and enantioselectivities (up to 95% yields and >99% ee). This protocol has good compatibility with a series of substituted (Z)-β-acetylamino vinylsulfones or Z/E isomeric mixtures. A gram-scale reaction has also been