Rhodium-Catalyzed Intermolecular Chelation Controlled Alkene and Alkyne Hydroacylation: Synthetic Scope of β-<i>S</i>-Substituted Aldehyde Substrates
作者:Michael C. Willis、Helen E. Randell-Sly、Robert L. Woodward、Steven J. McNally、Gordon S. Currie
DOI:10.1021/jo060582o
日期:2006.7.1
The use of β-S-substituted aldehydes in rhodium-catalyzed intermolecular hydroacylation reactions is reported. Aldehydes substituted with either sulfide or thioacetal groups undergo efficient hydroacylation with a variety of electron-poor alkenes, such as enoates, in Stetter-like processes and with both electron-poor and neutral alkynes. In general, the reactions with electron-poor alkenes demonstrate
据报道,β- S-取代的醛在铑催化的分子间加氢酰化反应中的使用。被硫化物或硫缩醛基团取代的醛在类似Stetter的过程中与各种贫电子的烯烃(如烯酸酯)以及贫电子的和中性的炔烃进行有效的加氢酰化反应。通常,与贫电子烯烃的反应显示出对线性区域异构体的良好选择性,与炔烃的反应提供了对E具有优异选择性的烯酮产物-异构体。结果表明,该方法的范围很广,在两个反应组分上都可以耐受各种取代方式和官能团。研究表明,在许多炔烃加氢酰化反应中,一种新颖的CN导向作用可逆转区域选择性。催化剂负载量可低至0.1摩尔%。