Pd-catalysed general access to 7-membered N/O-heterocyclic compounds as potential agents against inflammation
作者:B. Thirupataiah、Gangireddy Sujeevan Reddy、Guntipally Mounika、Jetta Sandeep Kumar、Kazi Amirul Hossain、Jayesh Mudgal、Jessy E. Mathew、Gautham G. Shenoy、Marina Rajadurai、Kishore V. L. Parsa、Manojit Pal
DOI:10.1039/d1cc04140a
日期:——
A Pd-catalysed regioselective synthesis of 4,5-disubstituted 7-membered N/O-heterocycles was achieved via the 7-endo-dig cyclization followed by C–C bond formation of 2-(1-alkynyl)phenylacetamide. The ligand/additive free cascade reaction proceeded in the presence of PdCl2 in aqueous MeCN when the separate and individual use of methyl vinyl ketone and allyl bromide generally afforded an O- and N-heterocycle
biologically essential pyrroloquinolinones has been developed under Cp*CoIII catalysis, which involves a cascade reaction of C(7)–H alkenylation with alkynes followed by nucleophilic addition. A wide variety of internal alkynes including enyne, diyne, and ynamide and more challenging terminalalkynes were successfully employed for the annulation in good to excellent yield with high regioselectivity.
Copper Nitrate Mediated Regio- and Stereoselective Difunctionalization of Alkynes: A Direct Approach to α-Chloro-β-nitroolefins
作者:Mingchun Gao、Bin Xu
DOI:10.1021/acs.orglett.6b02464
日期:2016.9.16
An efficient copper nitrate mediated chloronitration reaction was developed for the direct synthesis of α-chloro-β-nitroolefins with high regio- and stereoselectivity from simple alkynes and low toxic stannous chloride. This protocol provides a direct access to polysubstituted alkenes with operational simplicity, good functional group tolerance, and a wide substrate scope. Various applications of given
Synthesis and cytotoxic evaluation of novel indenoisoquinoline-substituted triazole hybrids
作者:Tham Pham Thi、Thuy Giang Le Nhat、Thuong Ngo Hanh、Tan Luc Quang、Chinh Pham The、Tuyet Anh Dang Thi、Ha Thanh Nguyen、Thu Ha Nguyen、Phuong Hoang Thi、Tuyen Van Nguyen
DOI:10.1016/j.bmcl.2016.05.092
日期:2016.8
The synthesis of various substituted triazole–indenoisoquinoline hybrids was performed based on a CuI-catalyzed 1,3-cycloaddition between propargyl-substituted derivatives and the azide-containing indenoisoquinoline. Besides, a variety of N-(alkyl)propargylindenoisoquinolines was used as substrates for the construction of triazole–indenoisoquinoline–AZT conjugated via a click chemistry-mediated coupling
an efficient synthesis of α‐fluoroketones by insertion of hydrogen fluoride (HF) into the gold carbene intermediate, generated from a cationicgold catalyzed addition of N‐oxides to alkynes. This method results in excellent chemical yields for a wide range of alkyne substrates and demonstrates good functional‐group tolerance.