27192-99-0Relevant articles and documents
Synthesis of 7-hydroxy-6H-benzo[c]chromen-6-ones based on?a '[3+3] cyclization/domino retro-Michael-aldol-lactonization' strategy
Ullah, Ehsan,Appel, Bettina,Fischer, Christine,Langer, Peter
, p. 9694 - 9700 (2007/10/03)
The TiCl4-mediated [3+3] cyclization of 2,4-bis(trimethylsilyloxy)penta-1,3-diene with 3-silyloxyalk-2-en-1-ones afforded 2-acetylphenols, which were transformed into functionalized chromones. The Me3SiOTf-mediated condensation of the latter with 1,3-bis(silyl enol ethers) and subsequent domino 'retro-Michael-aldol-lactonization' reaction afforded 7-hydroxy-6H-benzo[c]chromen-6-ones.