Diastereoselective radical cyclization of bromoacetals (Ueno-Stork reaction) controlled by the acetal center
作者:Félix Villar、Philippe Renaud
DOI:10.1016/s0040-4039(98)01971-6
日期:1998.11
The stereochemistry of the 5-exo-trig cyclization of bromoacetals (Ueno-Stork cyclization) can be controlled from the stereogenic acetal center. High stereoselectivities have been observed for the formation of 4-substituted tetrahydrofurans. Preparation of an optically pure β-substituted γ-butyrolactone by use of an easily removable chiral auxiliary is reported.
可以从立体缩醛中心控制溴缩醛的5 -exo-trig环化(Ueno-Stork环化)的立体化学。对于形成4-取代的四氢呋喃,已经观察到高的立体选择性。报道了通过使用容易除去的手性助剂制备光学纯的β-取代的γ-丁内酯。