Syntheses oftrans- andcis-3-Methoxy-4-methylthio-2-piperidinethiones. Previously Proposed Structures for Raphanusanins, Structural Revision, and Biological Activities of Their Congeners
Syntheses oftrans- andcis-3-Methoxy-4-methylthio-2-piperidinethiones. Previously Proposed Structures for Raphanusanins, Structural Revision, and Biological Activities of Their Congeners
Trans- and cis-3-methoxy-4-methylthio-2-piperidinethiones previously proposed for raphanusanins as a light-induced growth inhibitor, have been synthesized starting from the known alpha,beta-unsaturated lactam. However, the spectral data of the synthetic compounds are incompatible with those of natural ones. Thus, reexamination of H-1 and C-13 NMR spectra of the natural samples has led to correct structures for raphanusanins. The synthetic compounds also show a growth inhibitory activity.