Highly enantioselective sequential Claisen–Ireland/metathesis: synthesis of cycloalkenes bearing two contiguous highly functionalized asymmetric centres
摘要:
A sequence of two reactions, consisting of a highly stereoselective silylated ketene acetal Claisen-Ireland rearrangement followed by a ring closing metathesis, gave a stereocontrolled access to various carbocycles. (C) 2005 Published by Elsevier Ltd.
Highly enantioselective sequential Claisen–Ireland/metathesis: synthesis of cycloalkenes bearing two contiguous highly functionalized asymmetric centres
摘要:
A sequence of two reactions, consisting of a highly stereoselective silylated ketene acetal Claisen-Ireland rearrangement followed by a ring closing metathesis, gave a stereocontrolled access to various carbocycles. (C) 2005 Published by Elsevier Ltd.
The first asymmetric total synthesis of spirotetronate polyketides spirohexenolides A and B is reported. This synthesis features a ring-closing metathesis macrocyclization followed by double dehydration to achieve the C15 macrocycle with the unprecedented deformed nonplanar 1,3,5-triene conjugation.
首次报道了螺环酮酯聚酮化合物 spirohexenolides A 和 B 的不对称全合成。该合成的特点是先进行闭环复分解大环化,然后进行双脱水,以实现具有前所未有的变形非平面 1,3,5-三烯共轭的 C15 大环。