Hydroxymethylation of 2-Hydroxypropiophenones in Aqueous Medium: Synthesis of 3-Hydroxymethyl-3-methyl-4-chromanones and Their Conversion to 3-Methyl-4-chromanone-3-acetic Acids
- 1 January 1985
- journal article
- research article
- Published by Georg Thieme Verlag KG in Synthesis
- Vol. 1985 (09) , 876-878
- https://doi.org/10.1055/s-1985-31368
Abstract
Reaction of o-hydroxypropiophenone (1a) with aqueous formaldehyde in sodium hydroxide solution led to the mono-hydroxymethylated 2a and/or the bis-hydroxymethylated derivative 3a, as well as to 3-methyl-4-chromanone (4a) and/or 3-methyl-3-hydroxymethyl-4-chromanone (5a), according to the ratio of the reagents employed. The mechanism of formation of 5a from 1a was also demonstrated. Compound 5a and its 6-chloro derivative 5b, similarly prepared from 5-chloro-2-hydroxypropiophenone (1b), were converted by standard procedure to the corresponding 3-methyl-4-chromanone-3-acetic acids 8a, b.Keywords
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