Tributyltin hydride-mediated radical cyclisation of carbonyls to form functionalised oxygen and nitrogen heterocycles
作者:Jon Bentley、Paul A. Nilsson、Andrew F. Parsons
DOI:10.1039/b202077g
日期:2002.6.7
The tributyltin hydride-mediated cyclisation of unsaturated ethers and aminesbearing an aldehyde or α,β-unsaturated ketone group is reported. Cyclisation proceeds via reversible addition of the tributyltin radical to the carbonyl double bond to form an intermediate O-stannyl ketyl. This nucleophilic radical can add intramolecularly to electron-rich double bonds to form substituted 5- or 6-membered
Two new synthetic routes for (E)-N-methyl-2-styryl-4-quinolones have been established, both starting from (E)-2′-cinnamoylaminoacetophenones. In the first, (E)-2′-cinnamoylaminoacetophenones are cyclized and then methylated, while in the second they are methylated followed by in situ cyclization.