Ruthenium(II) Catalyzed Regiospecific C–H/O–H Annulations of Directing Arenes via Weak Coordination
摘要:
Ruthenium(II) catalyzed oxidative CH/OH annulations have been demonstrated using two different directing arenes viz. 2-arylquinolinone and 2-arylbenzoxazinone with internal alkynes. Regiospecific annulations have been observed for both directing arenes via the assistance of weaker carbonyl oxygen in the presence of a stronger nitrogen-directing site. In this substrate-controlled convergent protocol the weaker directing group dictates the annulation path.
A Mild, One-Pot Synthesis of 4-Quinolones via Sequential Pd-Catalyzed Amidation and Base-Promoted Cyclization
作者:Jinkun Huang、Ying Chen、Anthony O. King、Mina Dilmeghani、Robert D. Larsen、Margaret M. Faul
DOI:10.1021/ol800837z
日期:2008.6.1
A mild, one-pot synthesis of 4-quinolones is described. Under the optimal conditions, a variety of 2-substituted 4-quinolones were synthesized via sequential palladium-catalyzed amidation of 2'-bromoacetophenones followed by base-promoted intramolecular cyclization.
Ruthenium(II) Catalyzed Regiospecific C–H/O–H Annulations of Directing Arenes via Weak Coordination
作者:Arghya Banerjee、Sourav Kumar Santra、Prakash Ranjan Mohanta、Bhisma K. Patel
DOI:10.1021/acs.orglett.5b02967
日期:2015.11.20
Ruthenium(II) catalyzed oxidative CH/OH annulations have been demonstrated using two different directing arenes viz. 2-arylquinolinone and 2-arylbenzoxazinone with internal alkynes. Regiospecific annulations have been observed for both directing arenes via the assistance of weaker carbonyl oxygen in the presence of a stronger nitrogen-directing site. In this substrate-controlled convergent protocol the weaker directing group dictates the annulation path.
Novel pyrazole-4-carboxamides and aromatic carboxamides derivatives containing a hydrazine moiety as potential SDHIs
times more potent than that of Boscalid (EC50 = 0.74 μg/mL). Moreover, compound 4i also displayed promising antifungal activities against Sclerotinia sclerotiorum, B. cinerea, Alternaria alternate, and F. graminearum (IC50 = 1.21–4.50 μg/mL), indicating a broadspectrum of antifungal activities. Additionally, in vivo antifungal activities results showed that 4i could significantly inhibit the growth of