Mild and practical stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis–Hillman adducts using Appel agents (PPh3/CBr4): a facile synthesis of semiplenamides C and E
Appel agents (PPh3/CBr4) have been utilized for high-yielding stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis–Hillman adducts at room temperature. The method has been applied for the synthesis of naturallyoccurring bioactive fatty acid amides, semiplenamides C and E.
A novel protocol for the facile construction of tetrahydroquinoline fused tricyclic frameworks via an intramolecular 1,3-dipolar nitrile oxide cycloaddition reaction
作者:Manickam Bakthadoss、Varathan Vinayagam
DOI:10.1039/c5ob01060h
日期:——
An efficient method towards the synthesis of quinoline fusedtricyclic compounds involving an intramolecular1,3-dipolar nitrile oxide cycloaddition reaction utilizing Baylis–Hillman derivatives in good yields has been described for the first time. A highly functionalized tricyclic framework was created by forming two rings and two adjacent stereocentres through the formation of two N–C bonds, one
Metal-free, regio- and stereoselective S-methylation/phenylation of allyl halides using sulfoxides as sulfenylating agent
作者:Rakhee Choudhary、Rekha Bai、Pratibha Singh、Mahesh C. Sharma、Satpal Singh Badsara
DOI:10.1016/j.tet.2017.05.088
日期:2017.7
A DCP promoted metal-free, regio and stereoselective S-methylation/phenylation of allyl halides using sulfoxides as sulfenylating agent is described. A variety of multifunctional allyl halides underwent S-methylation and S-phenylation by using dimethyl sulfoxide (DMSO) and diphenyl sulfoxide (DPSO) under the reaction conditions employed to provide the resulting thioethers in good to excellent yields
A facile route for the synthesis of 20 new 1,4-disubstituted tetrazolone derivatives from allyl bromides of Baylis-Hillman adducts and various 1-substituted tetrazolones is described. All the synthesized compounds were screened for in vitro antibacterial and antifungal activity. Out of 20 newly synthesized compounds 16 compounds showed very good activity against the Gram-positive bacteria Bacillus subtilis compare to the standard drug ciprofloxacin. The compounds 7b, 7n and 7o showed remarkable activity against both the Gram-positive bacteria B. subtilis and Staphylococcus aureus. Two compounds 7l and 7o showed very good activity against the Gram-negative bacteria Escherichia coli. The compounds, when tested for antifungal activity four compounds- 7b, 7l, 7o and 7s- showed very good activity against the strain Aspergillus niger, whereas seven compounds- 7e, 7g, 7h, 7l, 7o and 7s- display good activity against Candida albicans. Compounds 7b, 7e, 7g, 7l and 7o exhibited very good-to-high activity towards all the strains tested.