Expedient, High-Yielding Synthesis of Silyl-Substituted Salen Ligands
作者:Avinash N. Thadani、Yong Huang、Viresh H. Rawal
DOI:10.1021/ol0713436
日期:2007.9.1
enantioselective catalysts. The salicylaldehyde precursors are synthesized from the silyl ethers of 2,6-dibromophenols via a one-pot double lithium halogen exchanges, to induce an intramolecular retro-Brook rearrangement and allow introduction of the aldehyde group. Condensation of the salicylaldehyde products with a chiral diamine affords the silyl-substituted salen ligands in high yields. The use of other