Synthetic transformations of higher terpenoids: XIV. Synthesis of pyrrololabdanoids from lambertianic acid
摘要:
Treatment of lambertianic acid methyl ester with lead tetraacetate gave terpenoid 2,5-diacetoxydihydrofuran which reacted with primary amines to yield 3 -terpenyl -substituted pyrrol-2(5H)-ones; the reaction with bydrazine led to the corresponding pyridazine derivative. The obtained furanoterpenoids underwent oxidative methoxylation by the action of N-chlorobenzenesulfonamide or N-bromosuccinimide in methanol. 2,5-Dimethoxydihydrofurans thus formed were smoothly converted into 3-substituted furan-2(5H)-one in acid medium. Hydrogenation of 2,5-dimethoxydihydrofurans, followed by treatment with amines, gave 1,3-disubstituted pyrroles.
Gram-scale synthesis of pinusolide and evaluation of its antileukemic potential
摘要:
Pinusolide (1), a known platelet-activating factor (PAF) receptor binding antagonist, was synthesized from lambertianic acid (2), a labdane-type diterpene readily accessible in multigram quantities from the Siberian pine tree. It was shown that 1 not only decreases the proliferation activity of tumor cells at relatively low concentrations but specifically induces apoptosis at 100 PM via the mitochondrial pathway in the Burkitt lymphoma cell line BJAB. Also, using primary lymphoblasts and leukemic cells from children with acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML), a significant DNA fragmentation in pinusolide-treated cells could be detected in an ex vivo apoptosis assay. (c) 2006 Elsevier Ltd. All rights reserved.