Highly enantioselective catalytic Diels-Alder addition promoted by a chiral bis(oxazoline)-magnesium complex
作者:E.J. Corey、Kazuaki Ishihara
DOI:10.1016/s0040-4039(00)61781-1
日期:1992.11
The new chiral bis(oxazoline) ligand 8 has been synthesized from (S)-phenylglycine and has been shown to form effective catalysts for enantioselective Diels-Alder addition in combination with ferric iodide, magnesium iodide or magnesium tetraphenylborate. Catalytic activation of the dienophile, 3-acryloyl-1,3-oxazolidine-2-one (4), in the magnesiwn system is proposed to involve tetrahedrally coordinated
新的手性双(恶唑啉)配体8是由(S)-苯基甘氨酸合成的,并且已显示出与碘化铁,碘化镁或四苯基硼酸镁结合形成对映选择性Diels-Alder加成的有效催化剂。提出了在菱镁矿系统中催化亲二烯体3-丙烯酰基-1,3-恶唑烷-2-酮(4)的催化活化作用,使四面体配位的镁参与一个正性配合物(10)。