Divergent Synthesis and Evaluation of Inhibitory Activities against Cyclooxygenases-1 and -2 of Natural Withasomnines and Analogues
作者:Yoshihide Usami、Ryo Watanabe、Yuiko Fujino、Makio Shibano、Chihiro Ishida、Hiroki Yoneyama、Shinya Harusawa、Hayato Ichikawa
DOI:10.1248/cpb.c12-00725
日期:——
The divergent synthesis of natural withasomnines and analogues was achieved from 4-hydroxypyrazoles, which was prepared via alkaline hydrolysis of the Baeyer–Villiger oxidation products from 4-formylpyrazoles. Key steps of this synthesis are regioselective Claisen rearrangement of 4-allyloxypyrazoles and the Suzuki–Miyaura coupling of 5,6-dihydro-4H-pyrrolo[1,2-b]pyrazol-3-yl trifluoromethanesulfonate and commercially available arylboronic acids. The Suzuki–Miyaura coupling at the final step of this strategy enabled facile access to natural withasomnines and their analogues. The biological activities of the twelve synthesized compounds against cyclooxygenases-1 and -2 (COX-1 and COX-2) were evaluated.
通过4-羟基吡唑的途径,实现了自然界存在的吲哚啉类化合物及其类似物的多样性合成。该合成方法是通过4-醛基吡唑的Baeyer-Villiger氧化产物经碱性水解制备4-羟基吡唑。合成过程中的关键步骤包括:4-烯丙氧基吡唑的选择性Claisen重排反应,以及5,6-二氢-4H-吡咯[1,2-b]吡唑-3-基三氟甲磺酸酯与市售的芳基硼酸的Suzuki-Miyaura耦合反应。该策略最后一步的Suzuki-Miyaura耦合反应使得自然界存在的吲哚啉类化合物及其类似物的便捷制备成为可能。评估了合成的十二种化合物对环氧合酶-1和-2(COX-1和COX-2)的生物活性。