Coupling of acceptor-substituted diazo compounds and tertiary thioamides: synthesis of enamino carbonyl compounds and their pharmacological evaluation
作者:Jim Secka、Arpan Pal、Francis A. Acquah、Blaine H. M. Mooers、Anand B. Karki、Dania Mahjoub、Mohamed K. Fakhr、David R. Wallace、Takuya Okada、Naoki Toyooka、Adama Kuta、Naga Koduri、Deacon Herndon、Kenneth P. Roberts、Zhiguo Wang、Bethany Hileman、Nisha Rajagopal、Syed R. Hussaini
DOI:10.1039/d2ra02415b
日期:——
This paper describes the synthesis of enamino carbonylcompounds by the copper(I)-catalyzed coupling of acceptor-substituted diazo compounds and tertiary thioamides. We plan to use this method to synthesize indolizidine (−)-237D analogs to find α6-selective antismoking agents. Therefore, we also performed in silico α6-nAchRs binding studies of selected products. Compounds with low root-mean-square
Chromenone‐Fused Pyrrolizines and Pyrrolizine Analogues of Lamellarins: Expanding the Lamellarin Family
作者:Stefania M. Scalzullo、Garreth L. Morgans、Robin Klintworth、Charles B. de Koning、Manuel A. Fernandes、Willem A. L. van Otterlo、Joseph P. Michael
DOI:10.1002/ejoc.202301230
日期:2024.2.12
-thione and ortho-oxygenated phenacyl halides undergo tandem pyrrole formation-lactonisation when heated with silica gel in a microwave reactor, giving chromenone-fused pyrrolizines. Further transformation yields analogues of lamellarin alkaloids in which a dihydropyrrolizine unit replaces the pyrrolo[2,1-a]isoquinoline component of the natural products.
由N- (乙氧基羰基甲基)吡咯烷-2-硫酮和邻氧化苯甲酰卤制成的烯胺酮在微波反应器中与硅胶一起加热时发生串联吡咯形成-内酯化反应,得到色烯酮稠合吡咯嗪。进一步转化产生板层生物碱的类似物,其中二氢吡咯嗪单元取代了天然产物中的吡咯并[2,1- a ]异喹啉成分。
Silica gel and microwave-promoted synthesis of dihydropyrrolizines and tetrahydroindolizines from enaminones
作者:Robin Klintworth、Garreth L Morgans、Stefania M Scalzullo、Charles B de Koning、Willem A L van Otterlo、Joseph P Michael
DOI:10.3762/bjoc.17.170
日期:——
various bromomethyl aryl and heteroaryl ketones, underwent cyclization in the presence of silica gel to give ethyl 6-(hetero)aryl-2,3-dihydro-1H-pyrrolizine-5-carboxylates within minutes upon microwave heating in xylene at 150 °C. Instead of functioning as a nucleophile, the enaminone acted as an electrophile at its carbonyl group during the cyclization. Yields of the bicyclic products were generally above
通过N- (乙氧基羰基甲基)吡咯烷-2-硫酮与各种溴甲基芳基和杂芳基酮之间的 Eschenmoser 硫化物收缩制备多种N- (乙氧基羰基甲基)烯胺酮,在硅胶存在下进行环化,得到乙基 6-(杂)芳基-2,3-二氢-1H-吡咯嗪-5-甲酸酯在二甲苯中于 150 °C 下微波加热几分钟内即可生成。在环化过程中,烯胺酮在其羰基处充当亲电子试剂,而不是充当亲核试剂。双环产品的收率一般在75%以上。由 ( E )-2-[2-(2-氧代-2-芳基亚乙基)哌啶-1-乙酯生产 2-芳基-5,6,7,8-四氢中氮茚-3-甲酸乙酯的类似微波辅助反应[酰基]乙酸酯在非极性溶剂中失败,但在较低温度和微波功率下在乙醇中发生,尽管需要更长的时间。提出了一种可能的环化机制,并描述了二氢吡咯嗪核心中新产生的吡咯环的进一步官能化。