Design,synthesis and antifungal activity of hinokitiol ester derivatives
As a continuous research on structure derivation and activity of natural monoterpenoid hinokitiol,15 novel hinokitol carboxylic acid esters(3)and 20 hinokitol sulfonate esters(isomers 5 and 6)were designed and synthesized from hinokitiol as a lead compound.The results of fungicidal activity showed that most of the target compounds at 50 μg/mL exhibited good fungicidal activity against Valsa mali,Rhizoctonia solani,Botrytis cinerea,and Colletotrichum orbiculare.The EC50 values of 3a,3f,3g,3o against R.solani were 0.96,1.05,1.29 and 1.88 μg/mL,respectively,the EC50 values of 3a,3e and 3j were 3.60,3.28 and 3.48 μg/mL against V.mali,and the EC50 values of 3d,3f and 3g were 0.77,0.51 and 0.67 μg/mL against C.orbiculare,respectively,which were superior to hinokitol.In general,the fungicidal activity of carboxylate derivatives was significantly better than that of sulfonate derivatives.The position isomers of sulfonate derivatives possessed different fungicidal activities,among which the compound with configuration 1 has better activities.
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