作者:Caterina Fraschetti、Maurizio Speranza、Laura Guarcini、Graziella Roselli、Antonello Filippi
DOI:10.1002/chir.22581
日期:2016.4
Boyer's reaction were analyzed using several simple, chiral, alcoholic substrates, a variable amount of BiBr3 and different solvents. Basic solvents inhibit the reaction, while cyclohexane works very well; thus, it was our choice for the present study. In contrast to previous works, BiBr3 behaves as a true catalyst, being not consumed during the reaction. Although poisoning of the catalyst occurs to some
使用几种简单的手性醇底物,不同量的BiBr 3和不同的溶剂分析了Boyer反应的进程和立体化学。碱性溶剂会抑制反应,而环己烷的效果非常好;因此,这是我们当前研究的选择。与以前的工作相反,BiBr 3表现为真正的催化剂,在反应过程中不被消耗。尽管催化剂中毒在一定程度上发生,但它并不影响反应产率(> 90%)。气相色谱/质谱(GC-MS)监测反应发现,例如,在存在酒精rac-1的情况下,异构醚4醚化为3。我们提出了一个适用于Boyer反应和跨醚化反应的统一机理模型,在该模型中,由BiBr 3的铋(III)与醇和醚的氧原子结合形成的n加合物中间体的电子性质对两者均起着关键作用。反应性和反应的立体化学结果。手性28:269–275,2016。©2016 Wiley Periodicals,Inc.