Geometrically Selective Synthesis of (E)-Enamides via Radical Allylation of Alkyl Halides with α-Aminoallylic Stannanes

The reaction of α-(carbonylamino)allylic stannanes and alkyl halides using Et₃B as a radical initiator selectively afforded (E)-enamides. A radical mechanism enables the E selectivity, which is unusual in a reaction using α-aminoallylic metals. In addition, this reaction system achieved a wide degree of functional group tolerance and an efficient chiral transfer reaction.

Synthesis and lateral root-inducing activity of novel N-substituted-2-piperidones with a 1,4-benzodioxan ring

Novel N-substituted-2-piperidones with a 1,4-benzodioxan ring were prepared and evaluated for their activity to induce lateral roots in lettuce seedlings. Compounds were obtained by aldol condensation of the lithium enolate of N-substituted-2-piperidones with 1,4-benzodioxan-6-carbaldehyde. Of the series compounds tested, N-cinnamyl-3-[1-(1,4-benzodioxan-6-yl)-1-hydroxymethyl]-2-piperidone (2e) had the highest activity. In seedlings treated with 10 ppm of 2e, all of the primary roots formed lateral roots. Only erythro-2e showed lateral root-inducing activity, while threo-2e was inactive.