Copper(I)-Catalyzed One-Pot Sequential [3+2]/[8+2] Annulations for the (<i>Z</i>)-Selective Construction of Heterocyclic Diazabicyclo[5.3.0]decatrienes
作者:Tang-Lin Liu、Qing-Hua Li、Liang Wei、Yong Xiong、Chun-Jiang Wang
DOI:10.1002/adsc.201700044
日期:2017.6.6
An efficientcopper(I)‐catalyzed one‐pot domino reaction for the (Z)‐selective construction of diazabicyclo[5.3.0]decatriene derivatives under mild conditions has been developed. This protocol was initiated by a Cu(I)‐catalyzed azide‐alkyne cycloaddition (CuAAC), followed by a ring opening rearrangement and then subsequent higher‐order [8+2] cycloaddition of azaheptafulvene with ketenimine intermediates
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。
Single and Consecutive Cyclization Reactions of Alkynyl Carbene Complexes and 8-Azaheptafulvenes: Direct Access to Polycyclic Pyrrole and Indole Derivatives
作者:José Barluenga、Jaime García-Rodríguez、Ángel L. Suárez-Sobrino、Miguel Tomás
DOI:10.1002/chem.200901257
日期:2009.9.7
The reactivity of alkynyl and enynyl Fischer carbene complexes towards 8‐azaheptafulvenes is examined. Alkynyl carbenes 1 a–f undergo regioselective [8+2] heterocyclization with 8‐aryl‐8‐azaheptafulvenes 2 a, b providing cycloheptapyrroles 3 and 4 with metal carbene or ester functionality at C3. Moreover, consecutive cyclizationreactions are involved when enynyl carbenes are used. Thus, the cyclopenta[b]pyrrole
Catalytic Asymmetric [8+2] Annulation Reactions Promoted by a Recyclable Immobilized Isothiourea
作者:Shoulei Wang、Carles Rodríguez-Escrich、Miquel A. Pericàs
DOI:10.1002/anie.201707341
日期:2017.11.20
enriched cycloheptatrienes fused to a pyrrolidone ring on the basis of an isothiourea‐catalyzed periselective [8+2] cycloadditionreaction between chiral ammonium enolates (generated in situ from carboxylic acids) and azaheptafulvenes. The resulting bicyclic compounds can be hydrogenated, but, most remarkably, they can also undergo completely regioselective [4+2] cycloaddition with active dienophiles to
Site specificity in cycloadditions of diphenylnitrile imine with 8-substituted-8-azaheptafulvenes and tricarbonyl (8-azaheptafulvene) iron complexes
作者:R. Gandolfi、L. Toma
DOI:10.1016/0040-4020(80)80045-7
日期:1980.1
mixture of two [8+4]-adducts in high yield. The mechanism of the reaction was investigated. The [8+4]-adducts underwent easily a reversible thermal 1,7-sigmatropic shift involving an sp3 nitrogen centre. Diphenylnitrile imine reacted also with tricarbonyl(8-azaheptafutvene)ironcomplexes lo give adducts to the CN double bond, the degradative oxidation of which with trimethylamine-N-oxide was investigated