An Isomünchnone-Based Method for the Synthesis of Highly Substituted 2(1H)-Pyridones
摘要:
1-(Benzenesulfonyl-diazoacetyl)-pyrrolidin-2-one was prepared by a diazo transfer of 1-(benzenesulfonylacetyl)-pyrrolidin-2-one with p-acetamidobenzenesulfonyl azide and triethylamine. Treatment; of the diazoimide with a catalytic quantity of rhodium(II) acetate resulted in the formation of an isomunchnone dipole, which underwent bimolecular trapping with various dipolarophiles in high yield. The initially formed cycloadducts were not isolable or observed, as they all readily underwent ring opening to give the 3-hydroxy-2(1H)-pyridone ring system. The 3-hydroxy-2(1H)-pyridones were readily converted to the corresponding triflates, which function as suitable substrates in various types of palladium-catalyzed cross-coupling reactions. Commercial tetrakis(triphenylphoshine)palladium was found to be a particularly effective catalyst for the cross-coupling with aryl, vinyl, and acetylenic partners. An application of the method to the synthesis of the indolizidine alkaloid (+/-)-ipalbidine was carried out in eight steps in 17% overall yield. The angiotensin-converting enzyme inhibitor (-)-A58365A was also synthesized by a process based on the [3 + 2]-cycloaddition reaction of a phenylsulfonyl substituted isomunchnone intermediate. The starting material for this process was prepared from L-pyroglutamic acid and involved using a diazo phenylsulfonyl substituted pyrrolidine imide. Treatment of the diazoimide with Rh-2(OAc)(4) in the presence of methyl vinyl ketone afforded a 3-hydroxy-2-pyridone derivative, which was subsequently converted to the ACE inhibitor in six additional steps.
An Isomünchnone-Based Method for the Synthesis of Highly Substituted 2(1H)-Pyridones
摘要:
1-(Benzenesulfonyl-diazoacetyl)-pyrrolidin-2-one was prepared by a diazo transfer of 1-(benzenesulfonylacetyl)-pyrrolidin-2-one with p-acetamidobenzenesulfonyl azide and triethylamine. Treatment; of the diazoimide with a catalytic quantity of rhodium(II) acetate resulted in the formation of an isomunchnone dipole, which underwent bimolecular trapping with various dipolarophiles in high yield. The initially formed cycloadducts were not isolable or observed, as they all readily underwent ring opening to give the 3-hydroxy-2(1H)-pyridone ring system. The 3-hydroxy-2(1H)-pyridones were readily converted to the corresponding triflates, which function as suitable substrates in various types of palladium-catalyzed cross-coupling reactions. Commercial tetrakis(triphenylphoshine)palladium was found to be a particularly effective catalyst for the cross-coupling with aryl, vinyl, and acetylenic partners. An application of the method to the synthesis of the indolizidine alkaloid (+/-)-ipalbidine was carried out in eight steps in 17% overall yield. The angiotensin-converting enzyme inhibitor (-)-A58365A was also synthesized by a process based on the [3 + 2]-cycloaddition reaction of a phenylsulfonyl substituted isomunchnone intermediate. The starting material for this process was prepared from L-pyroglutamic acid and involved using a diazo phenylsulfonyl substituted pyrrolidine imide. Treatment of the diazoimide with Rh-2(OAc)(4) in the presence of methyl vinyl ketone afforded a 3-hydroxy-2-pyridone derivative, which was subsequently converted to the ACE inhibitor in six additional steps.
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
[EN] PYRIDINYL BASED APOPTOSIS SIGNAL-REGULATION KINASE INHIBITORS<br/>[FR] INHIBITEURS DE KINASE DE RÉGULATION DU SIGNAL APOPTOTIQUE À BASE DE PYRIDINYLE
申请人:FRONTHERA U S PHARMACEUTICALS LLC
公开号:WO2018151830A1
公开(公告)日:2018-08-23
Apoptosis signal-regulating kinase 1 (ASK1) activation and signaling have been reported to play an important role in a broad range of diseases including neurodegenerative, cardiovascular, inflammatory, autoimmunity and metabolic disorders. Disclosed herein is the synthesis of pyridinyl derived therapeutic agents that function as inhibitors of ASK 1 as well as their pharmaceutical compositions and methods of use.
Synthesis of a 2(1<i>H</i>)-Pyridone Library via Rhodium-Catalyzed Formation of Isomunchones
作者:Subhasis De、Lu Chen、Shuxing Zhang、Scott R. Gilbertson
DOI:10.1021/co400067q
日期:2013.7.8
Through the use of the dipolar cycloaddition of isomunchones with olefins the 2(1H)-pyridone ring system has been synthesized.(1) The use of different cyclization partners followed by diversification of the initial scaffold has provded libraries of 4-hydroxy-2(1H)-pyridones. There are no examples of this ring system in either PubChem or the MLSMR