Rh(II) Catalyzed High Order Cycloadditions of 8-Azaheptafulvenes with <i>N</i>-Sulfonyl 1,2,3-Triazloes or α-Oxo Diazocompounds
作者:Wei Chen、Ya-Li Bai、Yong-Chun Luo、Peng-Fei Xu
DOI:10.1021/acs.orglett.6b03542
日期:2017.1.20
A novel strategy was developed for the application of Rh carbenes generated from readily accessible N-sulfonyl 1,2,3,-triazoles or diazocompouds in the high order cycloadditions, which offered an efficient route to a variety of N-containing medium-sized rings. The process provided a wide range of cyclohepta[b]pyrazine and cyclohepta[b]pyrrolone derivatives with high yields.
已开发出一种新的策略,用于将由易于获得的N-磺酰基1,2,3,-三唑或重氮化合物生成的Rh卡宾化合物以高阶环加成的形式应用,这为连接各种含N的中型环提供了一条有效途径。该方法以高收率提供了多种环庚[ b ]吡嗪和环庚[ b ]吡咯烷酮衍生物。
Iridium(III)-Catalyzed C(3)–H Alkylation of Isoquinolines via Metal Carbene Migratory Insertion
An Ir(III)-catalyzed C(3)–H alkylation of N-acetyl-1,2-dihydroisoquinolines with diverse acceptor–acceptor diazo compounds has been achieved under a single catalytic system via metal carbene migratory insertion. Moreover, further synthetic transformations of the alkylated products such as aromatization, selective decarboxylation, and decarbonylation lead to the formation of several synthetically viable
Microwave-accelerated and efficient synthesis of structurally diverse <i>N</i>-(2,2-diphenylvinyl)-β-oxoamides
作者:Xingpeng Chen、Yelong Lei、Duo Fu、Jiaxi Xu
DOI:10.1039/d1ob01359a
日期:——
N-(2,2-Diphenylvinyl)-β-oxoamides are both the structural moiety of biologically active compounds and important synthetic intermediates. Structurally diverse N-(2,2-diphenylvinyl)-β-oxoamides are prepared efficiently from 2-diazo-1,3-dicarbonyl compounds and N-alkyl-2,2-diphenylaziridines via an electrophilic ring opening reaction under two different reaction conditions of reflux and microwave irradiation
N -(2,2-二苯基乙烯基)-β-草酰胺既是生物活性化合物的结构部分,也是重要的合成中间体。2-重氮基-1,3-二羰基化合物和N-烷基-2,2-二苯基氮丙啶在两种不同反应条件下通过亲电开环反应有效制备结构多样的N- (2,2-二苯基乙烯基)-β-氧代酰胺回流和微波辐射。2-Diazo-1,3-dicarbonyl 化合物在加热下发生 Wolff 重排,生成 α-氧代烯,其与N-烷基氮丙啶发生亲电反应,直接生成结构多样的N-(2,2-diphenylvinyl)-β-oxoamides 在微波辐射下具有良好至优异的产率。微波照射明显有效地加速了反应。2-重氮-1,3-二酮和2-重氮-3-氧代链烷酸烷基酯都很好用。该反应无催化剂,原子经济性高,仅涉及氮损失,不需要添加剂。该产品是用于方便制备多取代β-内酰胺衍生物的有用合成子。
Tandem Synthesis of Benzo[<i>b</i>]carbazoles and Their Photoluminescent Properties
作者:Yanpeng Xing、Binbin Hu、Qijun Yao、Ping Lu、Yanguang Wang
DOI:10.1002/chem.201301887
日期:2013.9.16
5 H‐Benzo[b]carbazoles were prepared through a tandem reaction between 2‐ethynyl‐N‐triphenylphosphoranylidene anilines and α‐diazoketones through ketenimine intermediates in moderate‐to‐good yields. By using this approach, benzo[b]benzo[5,6]indolo[3,2‐h]carbazoles, fluoreno[9,1‐ab]carbazoles, and fluoreno[9,1‐ab]fluoreno[1′,9′:5,6,7]indolo[3,2‐h]carbazoles were constructed in one pot. Moreover, the
通过2-乙炔基-N-三苯基磷酰亚苯胺苯胺和α-二氮酮通过酮亚胺中间体的串联反应,以中等至良好的产率制备了5 H-苯并[ b ]咔唑。通过使用这种方法,苯并[ b ]苯并[5,6]吲哚并[3,2- h ]咔唑,芴[9,1- ab ]咔唑和芴[9,1- ab ]氟[1',9 ′:5,6,7] indolo [3,2- h ]咔唑是在一个锅中制成的。而且,最终产物发出的光在410-521 nm范围内,量子产率高达62%。
Photocatalyzed Dual Strain Release of [1.1.1]Propellane with Diazo Compounds
作者:Jiahao Hu、Xiaobin Yuan、Yufei Li、Xiaoyu Chen、Zaicheng Nie、Mong-Feng Chiou、Yajun Li、Hongli Bao
DOI:10.1021/acscatal.4c00533
日期:2024.4.19
L-menthol, metronidazole, and geraniol, can be applied to these transformations. Importantly, this method allows the cleavage and formation of multiple C–C bonds in a photocatalyzed tandem intersystem crossing (ISC)/radical ring-opening/radical–radical recombination process, and the products can be easily transformed into synthetically challenging spiro compounds, such as spiro [2.3] and spiro [3.4] compounds