Reactions of Phosphonium Ylides with S<sub>8</sub>or Se in the Presence of Amines. Formation of Thioaldehydes or Selenoaldehydes
作者:Kentaro Okuma、Yasuo Komiya、Hiroshi Ohta
DOI:10.1246/cl.1988.1145
日期:1988.7.5
The reaction of phosphonium ylides with elemental sulfur gave thioaldehydes which were successfully changed to corresponding thioamides when treated with secondary amines. On the other hand, the reaction of selenoaldehydes with secondary amines afforded bis(dialkylamino)methanes in good yields.
Direct Aminoalkylation of α-Branched Aldehydes with in situ Generated Glycine Cation Equivalents
作者:Nikolaus Risch、Stefan Piper
DOI:10.1055/s-2004-829536
日期:——
The efficient synthesis of β-formyl-α-aminocarboxylates 4 by direct aminoalkylation of aldehydes with in situ generated ternaryiminiumsalts from inexpensive starting materials is described. These compounds are easily transformed into α-amino-β,β-dialkyl-γ-butyrolactones 10 and a,a-dialkyl-β-dialkylamino-butane-1,4-diols 11 and can be used as versatile building blocks.