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A mild and efficient method is described for the synthesis of dihydroquinazoline derivatives via intramolecular hetero-Michael addition of ureas to ortho-substituted α,β-unsaturated esters in the presence of NaOH in THF with high chemical yield.
Cyclic phosphoramidites have been obtained with high diastereomeric excess without chromatographic purification. They have been converted to phosphite triesters in a stereoselective manner, using the relatively bulky, acidic 2-bromo-4,5-dicyanoimidazole as a catalyst.
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