Bis(oxazoline) and Bis(oxazolinyl)pyridine Copper Complexes as Enantioselective Diels−Alder Catalysts: Reaction Scope and Synthetic Applications
作者:David A. Evans、David M. Barnes、Jeffrey S. Johnson、Thomas Lectka、Peter von Matt、Scott J. Miller、Jerry A. Murry、Roger D. Norcross、Eileen A. Shaughnessy、Kevin R. Campos
DOI:10.1021/ja991191c
日期:1999.8.1
the use of this chiral catalyst in more complex Diels−Alder processes, are described. Similarly, the cationic copper complex 9a, [Cu((S,S)-t-Bu-pybox)](SbF6)2, is effective in the Diels−Alder reactions of monodentate acrolein dienophiles while the closely related complex, 9d [Cu((S,S)-Bn-pybox)](SbF6)2, is the preferred Lewis acid catalyst for acrylate dienophiles in reactions with cyclopentadiene.
已经研究了由双(恶唑啉)铜配合物催化的 Diels-Alder 反应的范围。特别是,[Cu((S,S)-t-Bu-box)](SbF6)2 (1b) 已被证明可以催化 3-propenoyl-2-oxazolidinone (2) 和一系列的 Diels-Alder 反应。具有高对映选择性的取代二烯。这种阳离子复合物也已成功用于类似分子内过程的催化。描述了 ent-Δ1-四氢大麻酚、ent-莽草酸和 isopulo'upone 的全合成,其特点是在更复杂的 Diels-Alder 过程中使用这种手性催化剂。类似地,阳离子铜配合物 9a,[Cu((S,S)-t-Bu-pybox)](SbF6)2,在单齿丙烯醛亲二烯体的 Diels-Alder 反应中是有效的,而密切相关的配合物 9d [Cu ((S,S)-Bn-pybox)](SbF6)2,