Synthesis of Dihydrofurans and Dihydropyrans with Unsaturated Side Chains Based on Ring Size-Selective Ring-Closing Metathesis
作者:Bernd Schmidt、Stefan Nave
DOI:10.1002/adsc.200600473
日期:2007.1.8
Enantiomerically pure 1,5-hexadiene-3,4-diol, derived from D-mannitol in a few steps, may serve as a starting material for enantiopure dihydropyrans and dihydrofurans bearing an unsaturated side chain which is amenable for further synthetic transformations. The synthesis relies on a ring size-selective ring-closing metathesis reaction of a triene. Most likely, a catalyst-directing effect of an allylic
在几个步骤中衍生自D-甘露醇的对映体纯的1,5-己二烯-3,4-二醇可作为对映体纯的二氢吡喃和带有不饱和侧链的二氢呋喃的原料,所述不饱和侧链适合于进一步的合成转化。合成依赖于三烯的环尺寸选择的闭环复分解反应。最可能的是,烯丙基羟基的催化剂导向作用是选择性的原因。