摘要:
Novel 10-membered pyrimidine enediynes (3 and 4) were synthesized in seven and eight steps, respectively. These compounds were compared for their abilities to undergo Bergman cyclization both thermally and photochemically, Alcohol 3 readily cyclized both thermally and photochemically in (PrOH)-Pr-i, while ketone 4 only showed efficient thermal cyclization, Both compounds were also shown to cleave dsDNA under the appropriate conditions.