Cu-Catalyzed Solvent-free, Pot-economic Synthesis of 1,3-Dynes from 1,1-Dibromoalkenes in the Presence of DBU•H2O

Venkata Ramana Doddi, Shiva Krishna Moodapelly, Yerramsetti Nanaji, Gangavaram V. M. Sharma, Kanaparthy Suneeel
2021 ARKIVOC  
An efficient synthesis of 1,3-diynes directly from 1,1-dibromoalkenes has been achieved by utilizing hydrated 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU.H2O) as a sole reagent and a catalyst CuI. In general, 1,3-diynes were synthesized from corresponding terminal alkynes, which in turn were obtained from 1,1-dibromoalkenes. The DBU.H2O allowed the synthesis of 1,3-diynes not only in a pot-efficient manner but also under solvent-free conditions at ambient temperature. A plausible mechanism is
more » ... ed via 1-bromoalkynes intermediate instead of terminal alkynes.
doi:10.24820/ark.5550190.p011.466 fatcat:yeekdrvd2fd6pnuuynfqsmp2yq