Add time:08/19/2019         Source:sciencedirect.com

The two isomeric 7-benzyl-2-(phenoxymethyl)-2,3,6,7,8,9-hexahydro-5H-[1,3]oxazolo[3,2-a] pyrido[4,3-d]pyrimidin-5-one 3 and 7-benzyl-2-(phenoxymethyl)-1,2,6,7,8,9-hexahydro-5H-[1,3]oxazolo[3,2-a]pyrido[3,4-e]pyrimidin-5-one 4 were synthesized by a one-step cyclocondensation from 5-(phenoxymethyl)-2-amino-2-oxazoline 1 with N-benzyl-3-(ethoxycarbonyl)-4-piperidinone hydrochloride 2. Their structures were assigned by comparison of two dimensional NMR spectra (HMBC, NOESY) with the results obtained from theoretical calculations. The structure of one related hydrolysis compound was established using X-ray crystallography, allowing to further confirm the structure assignment.

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