Allyl trans-2-(3-bromo-2-oxopropyl)-3-methoxy-1-piperidinecarboxylate → Allyl trans-2-[3-(7-Bromo-6-ethylthioquinazolin-4(3H)-on-3-yl)-2-oxopropyl]-3-methoxy-1-piperidinecarboxylate

Participants

Reaction Steps

In the manner of Example 4, 0.743 g (0.00224 mol) of 7-bromo-6-ethylthioquinazolin-4(3H)-one formic acid salt and 0.750 g (0.00224 mol) of allyl trans-2-(3-bromo-2-oxopropyl)-3-methoxy-1-piperidinecarboxylate were converted into the title compound. After flash chromatography on silica gel (eluant 3% methanol in chloroform) there was obtained the pure product: yield 0.61 g (51%) mass spectrum m/e 537 (molecular ion with expected isotope pattern), 41 (parent peak, CH2 =CH--CH2 +) among others. 1H--NMR(CDCl3) 1.4 ppm (triplet, 3H, SCH2CH3), 1.4-2.1 (multiplet, 4H, OCHCH2CH2CH2N), 2.8-3.4 (multiplet, 6H, NCH2, SCH2CH3, COCH2CH), 3.4 (singlet, 3H, OCH3), 4.0 (broad singlet, 1H, CHNCO), 4.6 (doublet, 2H, CH2CH=CH2), 5.0 (singlet, 2H, NCH2CO), 5.0-5.5 (multiplet, 2H, CH=CH2), 5.6-6.1 (octet, 1H, CH2 =CH), 7.3 (singlet, 1H, aromatic H), 7.9 (singlet, 2H, aromatic H, N=CH--N).

Provenance & Evidence