Synthesis of (R)- and (S)-2-N-methylamino-2,3-dimethylbutanamides and (R)- and (S)-(5-isopropyl-1,5-dimethyl-4,5-dihydro-1H-imidazol-4-on-2-yl)pyridines

Add time:07/20/2019    Source:sciencedirect.com

Both (R)- and (S)-2-N-methylamino-2,3-dimethylbutanamides have been prepared by the reductive benzylation of (R)- and (S)-2-amino-2,3-dimethylbutanamides, followed by reductive methylation and hydrogenolytic removal of the benzyl group. The reductive benzylation is chemoselective, and not accompanied by dibenzylation even with the application of excess benzaldehyde. Acylation of the (R)- and (S)-2-N-methylamino-2,3-dimethylbutanamides with picolinic acid and subsequent ring closure gave the respective (R)- and (S)-(5-isopropyl-1,5-dimethyl-4,5-dihydro-1H-imidazol-4-on-2-yl)pyridines. Their complexes with Cu(I) catalyze the Kharash–Sosnovsky allylic oxidation with overall yields as high as 99% but with low enantioselectivity.

We also recommend Trading Suppliers and Manufacturers of 4-(N-benzyl-N-methylamino)benzaldehyde (cas 1215-41-4). Pls Click Website Link as below: cas 1215-41-4 suppliers

Prev:Investigation of the l-phenylacetylcarbinol process to substituted benzaldehydes of interest
Next:Manufacturing by-products from, and stereochemical outcomes of the biotransformation of benzaldehyde used in the synthesis of methamphetamine)