The development of a new class of hydrazide type organocatalyst, (4R,5R)-1,3-bis(isopropylamino)-4,5-dihenylimidazolidin-2-one 2a, for enantioselective DielsâAlder reactions between cyclopentadiene and α,β-unsaturated aldehydes are presented. The new organocatalyst 2a promoted the reaction, affording DielsâAlder adducts in good yields with good levels of enantioselectivity.
                                    本文介绍了一类新型
肼型有机催化剂(4R,5R)-1,3-双(异丙
氨基)-
4,5-二苯基咪唑啉-2-酮2a在
环戊二烯与α,β-不饱和醛的对映选择性狄尔斯-阿尔德反应中的发展。新型有机催化剂2a促进了反应的进行,以良好的产率和较高
水平的手性选择性得到了狄尔斯-阿尔德加成产物。