Benzene → 4,6-Dichloro-5-(1,3-dioxolan-2-yl)pyrimidine

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Reaction Steps

A mixture of 300 ml benzene and 8.2 ml ethylene glycol was heated to reflux and 100 ml solution was distilled off. To the hot solution was added 4,6-dichloro-5-pyrimidinecarbaldehyde (Bionet, 8.6 g, 48.6 mmol) and p-toluenesulfonic acid monohydrate (Aldrich, 150 mg, 0.8 mmol). The mixture was returned to reflux and water was removed via Dean-Stark trap over 3 h. After cooling, the solvents were removed under vacuum to yield a dry, yellow solid. The solids were slurried in H2O (30 ml)/saturated NaHCO3 solution (30 ml). White solid 107 was filtered off and dried under vacuum (8.8 g, 82%). Compound 107: mp 108-110° C.; MS (ES+ calculated: 221.04; found: 221/223 M+H). 1H NMR (400 MHz, DMSO-d6) δ 8.95 (s, 1H), 6.26 (s, 1H), 4.23 (m, 2H), 4.05 (m, 2H).

Provenance & Evidence