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Rapid parallel liquid-phase synthesis of pyrazoles has first been developed. The 1,3-dipolar cycloaddition between nitrilimines generated in situ and soluble polymer-supported alkynyl or alkenyl dipolarophiles in parallel one-pot fashion gave the corresponding PEG-supported regioisomeric pyrazoles or regiospecific pyrazolines. The latter was assuredly oxidated by DDQ to PEG-supported regiospecific pyrazoles. Cleavage from the support under mild conditions afforded pyrazoles in good yields and high ouritv. 相似文献
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Indoxamycins A~F是从海洋放线菌中分离得到的一类聚酮化合物,它们均含有空间拥挤的[5,5,6]三环类笼状结构和6个连续的手性中心.前期活性研究表明,indoxamycins A和F对HT-29肿瘤细胞株具有显著的生长抑制活性.该综述总结了Carreira和丁寒锋两个小组在此家族天然产物全合成中取得的进展情况. 相似文献
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