Reactivity and diastereoselectivity of Michael additions of amines to achiral α,β-unsaturated thioamides
作者:Jacek G Sośnicki、Tadeusz S Jagodziński、Poul Erik Hansen
DOI:10.1016/s0040-4020(01)00849-3
日期:2001.10
aliphatic amines add to acyclic and cyclic α,β-unsaturated thioamides yielding β-amino-functionalized derivatives. In the case of cyclic acceptors, the formation of both kinetic and thermodynamically controlled products is observed. Tailoring of cis or trans products is thus possible. A mechanism for the addition to cyclic acceptors is proposed and evidence presented to support it. Ease of addition is studied
Temperature coefficient of NH chemical shifts of thioamides and amides in relation to structure
作者:Jacek G Sośnicki、Poul Erik Hansen
DOI:10.1016/j.molstruc.2004.01.006
日期:2004.8
measured in a large series of N-substituted-3-piperidinethiopropionamides in which the N⋯N distances are short but of varied length, as well as in a couple of the corresponding amides and in some simpler amides and thioamides. Geometries are calculated by means of ab initio DFT methods. The N-substituted-3-piperidinethiopropionamides show in most cases strong intramolecular N–H⋯N hydrogen bonds according