DBU-Mediated Efficient Synthesis of Diaryl Ethynes and Enynes from 1,1-Dibromoalkenes at Room Temperature
作者:Yadagiri Thummala、Ashok K. Morri、Galla V. Karunakar、Venkata Ramana Doddi
DOI:10.1002/ejoc.201801143
日期:2018.12.6
The DBU plays a triple role as base, nucleophile and ligand in the synthesis of internal alkynes from 1,1‐dibromoalkenes at ambient temperature.
在环境温度下,DBU在由1,1-二溴代烯烃合成内部炔烃中,起着碱基,亲核试剂和配体的三重作用。
Synthesis of Substituted Thioamides from <i>gem</i>
-Dibromoalkenes and Sodiumsulfide
作者:Ashok K. Morri、Yadagiri Thummala、Ramesh Adepu、Gangavaram V. M. Sharma、Subhash Ghosh、Venkata Ramana Doddi
DOI:10.1002/ejoc.201901411
日期:2019.11.14
Synthesis of thioamides from geminal dibromoalkenes, sodium sulfide and formamide have been reported under catalyst or additive free conditions. Control experiment and mechanistic studies revealed that necessary role of sodium sulfide in this overall transformation.
The thioamidation of <i>gem</i>-dibromoalkenes in an aqueous medium
作者:Jigarkumar K. Vankar、Ankush Gupta、Jaydeepbhai P. Jadav、Shankara H. Nanjegowda、Guddeangadi N. Gururaja
DOI:10.1039/d0ob02319a
日期:——
1-dibromoalkenes for thioamidesynthesis has been achieved in an aqueous medium. The presented green protocol emphasizes the suitability of aqueous media for the thioamidation reaction and enables greater selectivity with synthetic utility. A wide range of thioamides in moderate to excellent yields has been achieved using readily available starting materials, with the use of no organic solvents, catalysts
Pd-Catalyzed Domino Synthesis of Internal Alkynes Using Triarylbismuths as Multicoupling Organometallic Nucleophiles
作者:Maddali L. N. Rao、Deepak N. Jadhav、Priyabrata Dasgupta
DOI:10.1021/ol1004164
日期:2010.5.7
The domino coupling reaction of 1,1-dibromo-1-alkenes with triarylbismuth nucleophiles has been demonstrated to furnish disubstituted alkynes directly under catalytic palladium conditions. The couplings of triarylbismuths as multicoupling nucleophiles with 3 equiv of 1,1-dibromo-1alkenes are very fast, affording high yields of alkynes in a short reaction time. Thus, an efficient domino process has been accomplished using 1,1-dibromo-1-alkenes as surrogates for internal alkyne synthesis in couplings with triarylbismuths in a one-pot operation.
A rapid synthesis of lavendustin-mimetic small molecules by click fragment assembly
作者:Jieun Yoon、Jae-Sang Ryu
DOI:10.1016/j.bmcl.2010.05.014
日期:2010.7
Lavendustin-mimetic small molecules modifying the linker -CH(2)-NH- with an 1,2,3-triazole ring have been synthesized via a click chemistry. Two pharmacophoric fragments of lavendustin were varied to investigate chemical space and the auxophoric -CH(2)-NH- was altered to an 1,2,3-triazole for rapid click conjugation. The small molecules were evaluated against HCT116 colon cancer and CCRF-CEM leukemia cell lines. Among 28 analogues, 3-phenylpropyl ester 26b inhibited CCRF-CEM leukemia cell growth with GI(50) value of 0.9 mu M. (c) 2010 Elsevier Ltd. All rights reserved.