4-Morpholino-2-naphthol → 4-Morpholino-2-naphthol

Participants

Reaction Steps

4-Morpholino-2-naphthol was prepared as described in Example 2(b). A mixture of 4-morpholino-2-naphthol (0.50 g;0.0022 mol), 1,1-dianisylprop-2-yn-1-ol (0.59 g; 0.0022 mol), acidic alumina Brockmann 1(4 g) and toluene (35.0 ml) was heated and stirred for 1.5 h, cooled, filtered and the solid washed with toluene. The filtrate was evaporated to give an orange crystalline solid which was washed with diethyl ether to give 3,3-dianisyl -6-morpholino-3H-naphtho[2,1-b]pyran as a white solid (0.61 g;58% yield), m.pt. 211°-213° C. ##STR21##

Provenance & Evidence