Reznik Samuel K, Marcus Brian S, Leighton James L
Department of Chemistry, Columbia University, 3000 Broadway, New York, New York, 10027, USA. ; Tel: (+1) 212-854-4262.
Chem Sci. 2012 Nov 1;3(11):3326-3330. doi: 10.1039/C2SC21325G.
The first examples of the use of crotylation as a stereocontrolled complex fragment coupling strategy are described. Asymmetric aldehyde isoprenylation provides access to 2-substituted-1,3-butadienes that may be subjected to highly regio- and stereoselective 1,4 hydrosilylation with trichlorosilane. After complexation with a chiral diamine, the 2-sub-stituted--crotylsilanes may be employed in highly diastereoselective Sc(OTf)-catalyzed aldehdye crotylation reactions.
本文描述了将巴豆酰化用作立体控制的复杂片段偶联策略的首个实例。不对称醛异戊烯基化可得到2-取代-1,3-丁二烯,其可与三氯硅烷进行高度区域和立体选择性的1,4-氢化硅烷化反应。与手性二胺络合后,2-取代的巴豆基硅烷可用于Sc(OTf)催化的醛巴豆酰化反应中,该反应具有高度非对映选择性。