Phosphorus oxychloride → 1,3a-Dimethyl-3,3a,5,6-tetrahydro-4-oxa-2,10b-diazafluoranthene

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Reaction Steps

A mixture of N-[(1,3,4,9-tetrahydro-1-methylpyrano[3,4-b]indol-1-yl)methyl]-acetamide (2.7 g, described in Example 1), phosphorus oxychloride (1.8 ml) and dry benzene (150 ml) is stirred and refluxed for 2 hours, cooled and washed with water (10° C.). The aqueouslayer is separated, basified with 5N sodium hydroxide, and extracted with chloroform. The combined organic extracts are dried over magnesium sulfate, filtered and evaporated to give a residue of the title compound. The residue is dissolved in diethyl ether and hydrogen chloride is added until precipitation is completed. The precipitate is collected and crystallized from ethanol-diethyl ether to obtain the hydrochloride salt of the title compound (1.45 g); mp 226°-227° C.; ir(CHCl3) 2500, 1815, 1623, 1536, 1662 and 1575 cm-1 ; mr (CDCI3) δ 1.66 (s), 2.90 (m), 3.32 (s), 3,48 (d), 4.30 (m) and 7.51 (m).

Provenance & Evidence