Rhodium(II)-Catalyzed Cyclization of Bis(N-tosylhydrazone)s: An Efficient Approach towards Polycyclic Aromatic Compounds
作者:Ying Xia、Zhenxing Liu、Qing Xiao、Peiyuan Qu、Rui Ge、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201201374
日期:2012.6.4
Ahead of the PAC: Polycyclicaromaticcompounds (PACs) can be easily accessed by the combination of Suzuki–Miyaura cross‐coupling and a [Rh2(OAc)4]‐catalyzed carbene reaction using easily available bis(N‐tosylhydrazone)s as intermediates (see scheme; Ts=4‐toluenesulfonyl).
Efficient Synthesis of Dibenzo[<i>a</i>,<i>c</i>]cyclohepten-5-ones via a Sequential Suzuki−Miyaura Coupling and Aldol Condensation Reaction
作者:Young Lok Choi、Chan-Mo Yu、Bum Tae Kim、Jung-Nyoung Heo
DOI:10.1021/jo900508z
日期:2009.5.15
strategy for the synthesis of a 7-membered-ring system with a Suzuki−Miyaura coupling followed by an acid/base-promoted intramolecular aldol condensation reaction has been developed. The reaction of 2′-bromoacetophenones with 2-formylphenylboronic acids in the presence of Pd(OAc)2 and CataCXium PIntB L8 efficiently provided biaryl compounds, which were transformed to a wide array of dibenzo[a,c]cyclohepten-5-ones
Catalyst-Free Intramolecular Formal Carbon Insertion into σ-CC Bonds: A New Approach toward Phenanthrols and Naphthols
作者:Ying Xia、Peiyuan Qu、Zhenxing Liu、Rui Ge、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201209269
日期:2013.2.25
of carbonyl groups in keto aldehyde substrates has been exploited for the synthesis of phenanthrols, naphthols, and their heteroatom‐containing analogues. Key to this highly efficient and robust methodology is the catalyst‐free intramolecularformal diazo carboninsertion of N‐tosylhydrazones into keto CCbonds (see scheme).
Asymmetric Hydrogenation of Dibenzo[<i>c,e</i>]azepine Derivatives with Chiral Cationic Ruthenium Diamine Catalysts
作者:Shanshan Zhang、Fei Chen、Yan-Mei He、Qing-Hua Fan
DOI:10.1021/acs.orglett.9b01859
日期:2019.7.19
An efficient Ru-catalyzed asymmetrichydrogenation of dibenzo[c,e]azepines is reported. A series of seven-membered cyclic amines were obtained with moderate to excellent enantioselectivity. The catalyst counteranion played an important role in achieving high-level chiral induction. Moreover, a one-pot synthesis of chiral 6,7-dihydro-5H-dibenz[c,e]azepines via two-step reductive amination was also developed
报道了有效的Ru催化的二苯并[ c,e ] a庚因的不对称氢化。获得了一系列具有中等至优异对映选择性的七元环胺。催化剂抗衡阴离子在实现高水平手性诱导中起着重要作用。此外,还开发了通过两步还原胺化反应一锅合成手性6,7-二氢-5 H -dibenz [ c,e ]氮杂。
Polycyclic Aromatic Hydrocarbons via Iron(III)-Catalyzed Carbonyl–Olefin Metathesis
作者:Christopher C. McAtee、Paul S. Riehl、Corinna S. Schindler
DOI:10.1021/jacs.7b01114
日期:2017.3.1
Polycyclicaromatichydrocarbons are important structural motifs in organic chemistry, pharmaceutical chemistry, and materials science. The development of a new syntheticstrategytoward these compounds is described based on the design principle of iron(III)-catalyzed carbonyl-olefin metathesis reactions. This approach is characterized by its operational simplicity, high functional group compatibility