Electrophilic Cyclization of Buta-1,3-diynylarenes: Synthesis of Precursors of (Z)-3-Ene-1,5-diyne Systems Fused to Heterocycles
作者:Stefan Bräse、Irina Balova、Natalia Danilkina
DOI:10.1055/s-0030-1259547
日期:2011.3
simple, convenient, and promising strategy for the synthesis of 2-ethynyl-3-iodo-benzothiophenes, -benzofurans, and -indoles based on electrophilic cyclization of easily available ortho- functionalized (buta-1,3-diynyl)arenes was developed. The unique potential of using these compounds as starting materials for the syn- thesis of enediyne systems, containing thiophene, furan, and pyrrole units is demonstrated
Synthesis of 2-(buta-1,3-diynyl)-N,N-dimethylanilines Using Reductive Methylation Step
作者:Alexandra E. Kulyashova、Elena V. Mikheeva、Natalia A. Danilkina、Irina A. Balova
DOI:10.1016/j.mencom.2014.03.013
日期:2014.3
Synthesis of 2-(buta-1,3-diynyl)-N,N-dimethylanilines based on reductive methylation of ortho-iodoanilines using CH2O-NaBH3CN and coupling with terminal diacetylens was developed. Altered sequence including dimethylation of 2-(buta-1,3-diynyl)anilines was also successfully achieved and gave higher overall yields in the case of anilines without acceptor substituent in the ring.