Enantioenriched Bifunctional Crotylsilanes for the Asymmetric Synthesis of Orthogonally Protected 2-Methyl-1,3-diols
作者:Dongeun Kim、Jae Seung Lee、Lucia Lozano、Suk Bin Kong、Hyunsoo Han
DOI:10.1021/ol4026167
日期:2013.10.4
Enantiomerically pure α-substituted crotylsilane reagents I and ent-I undergo asymmetric aldehyde crotylation followed by Ir(I)-catalyzed diastereoselective allylic etherification to give a variety of orthogonally protected 2-methyl-1,3-diols at the synthetically useful level of yields and stereoselectivity. The reagents are air-stable and bifunctional so that they can be used in these reactions sequentially
对映体纯的α-取代的巴豆基硅烷试剂I和ent - I进行不对称醛的crotylation,然后进行Ir(I)催化的非对映选择性烯丙基醚化反应,以合成有用的收率得到各种正交保护的2-甲基-1,3-二醇和立体选择性。该试剂是空气稳定的和双功能的,因此可以在不依赖官能团调节的情况下依次用于这些反应中。