1,3-Dipolar Cycloaddition Chemistry for the Preparation of Novel Indolizinone-Based Compounds
作者:Edwin M. Mmutlane、Joel M. Harris、Albert Padwa
DOI:10.1021/jo0511492
日期:2005.9.1
7-b]indol-5-ones. To prepare furano-fused indolizinones, methyl 6-hydroxy-5-oxo-1,2,3,5-tetrahydroindolizine-8-carboxylate was etherified with different allyl halides, and the resultant allyl ethers were subjected to a thermal Claisen rearrangement to give the corresponding methyl 7-allyl-6-hydroxy-5-oxo-1,2,3,4-tetrahydroindolizine-8-carboxylates. Cyclization under Wacker oxidation conditions afforded
由5-(氧代-6)-三氟甲磺酰氧基-1,2,3,5-四氢吲哚嗪-8-羧酸甲酯开始,通过Rh(II)催化的1-(2-苯磺酰基-2)的1,3-偶极环加成反应获得(重氮基乙酰基)吡咯烷-2-酮和丙烯酸甲酯,可有效制备几种吲哚和呋喃并熔的吲哚并酮。在第一种情况下,三氟甲磺酸酯与各种取代的苯胺的钯介导的C-N偶联提供了所需的5-氧代-6-(芳基氨基)-1,2,3,5-四氢吲哚嗪-8-羧酸甲酯高产。6-(2-溴苯基氨基)-5-氧-1,2,3,5-四氢吲哚嗪-8-羧酸甲酯及其脱羧类似物6-(2-溴苯基氨基)-2,3-二氢-1 H-吲哚izin-5-one,以极高的产率合成,并经过分子内Heck环化反应,得到1,2,3,6-tetrahydroindolizino [6,7- b ] indol-5-ones。为了制备呋喃并稠合的吲哚嗪酮,将6-羟基-5-氧代-1,2,3,5-四氢吲哚嗪-8-羧酸甲酯与不