Asymmetric Desymmetrization Based on an Intramolecular Haloetherification: A Highly Effective and Recyclable Chiral Nonracemic Auxiliary, 2-exo-Methyl-3-endo-phenyl-5-norbornene-2-carboxaldehyde, formeso-1,3- andmeso-1,4-Diols
作者:Hiromichi Fujioka、Tetsuya Fujita、Naoyuki Kotoku、Yusuke Ohba、Yasushi Nagatomi、Atsushi Hiramatsu、Yasuyuki Kita
DOI:10.1002/chem.200400444
日期:2004.11.5
A new chiralauxiliary, a 3-endo-phenyl norbornene aldehyde derivative, which is a crystalline, very stable, and easily handled, was developed for the desymmetrization of meso-1,3- and meso-1,4-diols. The key step of the method, an intramolecular bromoetherification, proceeded in a highly diastereoselective manner. A four-step sequence, 1) acetalization, 2) intramolecular bromoetherification followed