Pd-catalyzed Oxidative Cross-coupling of Alkyl Chromium(0) Fischer Carbene Complexes with Organoboronic Acids
作者:Kang Wang、Jinghui Yang、Xingqi Yao、Jianbo Wang
DOI:10.1002/asia.201801278
日期:2018.11.2
Alkyl chromium(0) carbenecomplexes have been explored as the cross‐coupling partners in the palladium‐catalyzed reaction with aryl or alkenyl boronic acids. This coupling reaction displays the versatile reactivities of alkyl chromium(0) carbenes under palladium catalysis. Mechanistically, this transformation is proposed to involve deprotonation of the alkyl chromiumcarbene substrate to generate a
Pd-Catalyzed Cross-Coupling of Terminal Alkynes with Chromium(0) Fischer Carbene Complexes
作者:Kang Wang、Fengjin Wu、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.7b01096
日期:2017.6.2
Alkyl chromium(0) carbenecomplexes typically undergo cycloadditions with alkynes to afford carbo- or heterocyclic compounds. In the presence of Pd catalyst, it is demonstrated that a traditional cycloaddition pathway is completely altered: instead of cycloaddition, oxidative cross-coupling reaction of alkyl chromium(0) carbenecomplexes with terminal alkynes occurs. The coupling reaction exhibits
Photochemical reactions of chromium-alkoxycarbene complexes with stabilized ylides to produce push-pull captodative allenes
作者:Michael R. Sestrick、Michael Miller、Louis S. Hegedus
DOI:10.1021/ja00037a008
日期:1992.5
Photolysis of chromium alkoxycarbene complexes in the presence of stabilized ylides produced allenes having effect withdrawing groups on C-1 and electron donating groups on C-3. These highly reactive captodative allenes rearranged to 1,3-substituted-1,3-dienes under mildly acidic conditions and hydrolyzed to γ-ket-α,β-unsaturated esters, both in excellent yield
One-Pot Three-Component Synthesis of Quinoxaline, Quinazoline, and Phenazine Ring Systems Using Fischer Carbene Complexes
作者:Binay Ghorai、Soumita Mukherjee、Priyabrata Roy
DOI:10.1055/s-0030-1259973
日期:2011.5
One-pot, three-component synthesis of nitrogen-containing polycyclic heterocycles bearing two nitrogen atoms such as quinoxaline, quinazoline, and phenazine derivatives by the coupling of appropriate vicinal alkynylheteroaryl carbonyl derivatives with Fischer carbenecomplexes and dienophiles has been investigated. This involves the generation of furo[3,4-b]pyrazines, furo[3,4-d]pyrimidines, and furo[3
通过适当的邻位炔基杂芳基羰基衍生物与费歇尔卡宾配合物和二亲体的偶联,研究了一锅三组分合成含两个氮原子的含氮多环杂环化合物,如喹喔啉,喹唑啉和吩嗪衍生物。这涉及呋喃[3,4- b ]吡嗪,呋喃[3,4- d ]嘧啶和呋喃[3,4- b ]喹喔啉的瞬时中间体的生成,它们被合适的Diels-Alder二烯亲和物捕获在分子间或分子内方式。 氮杂异苯并呋喃-喹喔啉-喹唑啉-吩嗪-Diels-Alder反应-卡宾络合物
Synthesis of hydronaphthalenes through coupling of enyne-carbonyl compounds that contain pendant alkane groups with Fischer carbene complexes
作者:Rajesh Kumar Patti、Shaofeng Duan、Alejandro Camacho-Davila、Kris Waynant、Kenneth A. Dunn、James W. Herndon
DOI:10.1016/j.tetlet.2010.05.049
日期:2010.7
The coupling of enyne-carbonyl compounds that contain pendantalkene groups with Fischer carbene complexes to afford furans that contain pendantalkene groups is described. Subsequent intramolecular Diels–Alder reactions are effective in selected cases, resulting in hydronaphthalene systems after dehydration. Although the Diels–Alder event is thermodynamically unfavorable, the overall transformation