Water → p-Nitrobenzyl alpha-(3-phenoxymethyl-7-oxo-4-thia-2,6-diazabicyclo(3,2,0)hept-2-en-6-yl)-alpha-(1-morpholinoethylidene)acetate

Participants

Reaction Steps

To a solution of diphenyl 1-(3-phenoxymethyl-7-oxo-4-thia-2,6-diazabicyclo[3,2,0]hept-2-en-6-yl)-1-(p-nitrobenzyloxycarbonyl)-prop-1-en-2-yl phosphate (7.02 g) in ethyl acetate (70 ml) at 0°-5° C. was added morpholine (1.83 ml) dropwise and the reaction mixture stirred at this temperature for 2 hours. Water (30 ml) was added and the organic layer was separated, washed with water (30 ml) and saturated sodium chloride solution (30 ml), dried with magnesium sulphate, filtered and evaporated to give the title compound as a yellow foam in almost quantitative yield. TLC (silica) Rf 0.57 (ethyl acetate). The product was a mixture of geometric isomers (ca. 1:1.4) about the enamine double bond. NMRδCDCl3 1.93 (s), +2.43 (s) (3H), 3.17-3.93 (m, 8H), 4.90 (s, 2H), 5.25 (s, 2H), 5.68-6.13 (m, 2H) and 6.87-7.7+8.1-8.4 (m, 9H).

Provenance & Evidence