Novel conjugated cyclopentenones, 5-alkylidene-4-hydroxy-2-cyclopentenones (3) and 5-alkylidene-2-chloro-4-hydroxy-2-cyclopentenones (4) were synthesized from 4-tert-butyldimethylsilyloxy-2-cyclopentenone (5) by two different pathways. These new compounds and their synthetic intermediates strongly inhibited L1210 tumor cell growth in vitro.
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Sugiura et al. (1985) studied this question.