Metal-Catalyzed Cycloetherification Reactions of β,γ- and γ,δ-Allendiols: Chemo-, Regio-, and Stereocontrol in the Synthesis of Oxacycles
作者:Benito Alcaide、Pedro Almendros、Rocío Carrascosa、Teresa Martínez del Campo
DOI:10.1002/chem.201001520
日期:2010.11.22
and stereocontrolled metal‐catalyzed oxycyclization reactions of β,γ‐ and γ,δ‐allendiols, which were readily prepared from (R)‐2,3‐O‐isopropylideneglyceraldehyde. The application of PdII, PtII, AuIII, or LaIII salts as the catalysts gives controlled access to differently sized oxacycles in enantiopure form. Usually, chemoselective cyclization reactions occurred exclusively by attack of the secondary hydroxy
导致多种功能化对映体纯的四氢呋喃,二氢吡喃和四氢氧杂环丁烷的通用路线基于β,γ-和γ-δ-炔烃的化学,区域和立体控制的金属催化的氧化环化反应,这些反应很容易由(R)-2,3- O-异亚丙基甘油醛。使用Pd II,Pt II,Au III或La III盐作为催化剂,可以对映获得纯对映体形式的不同尺寸的oxacycles。通常,化学选择性环化反应仅通过仲羟基的攻击而发生(除了苯基β,γ-炔二醇3b和3d的氧溴化作用))为烯丙基碳原子。区域和立体控制问题主要受金属催化剂和取代基的性质影响。