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Naturally occurring pterocarpans 1a,b, pterocarpan 1c, isoflavane 2 and ortho-quinone 3 were synthesized in the racemic form and their cytotoxic effect was evaluated on the human leukemia cell lines K562 (resistant to oxidative stress), Lucena-1 (MDR phenotype) and HL-60. Ortho-quinone 3 (IC 50 =1.5μM, 1.8μM and 0.2μM, respectively) and catechol pterocarpan 1a (IC 50 =3.0μM, 3.7μM...