DIANANE-CrIII-salen Complexes as Highly Enantioselective Catalysts for Hetero-Diels–Alder Reactions of Aldehydes with Dienes
作者:Albrecht Berkessel、Nadine Vogl
DOI:10.1002/ejoc.200600359
日期:2006.11
applied to the hetero-Diels–Alder reaction of Danishefsky’s diene with various aldehydes. The reactions afford the corresponding 2-substituted 2,3-dihydro-4H-pyran-4-ones in high yields and enantioselectivities (up to 96 % ee). The effect of different counteranions of the complex on reactivity as well as enantioselectivity has been investigated. Besides Danishefsky’s diene, reaction of the less reactive
合成了一种以DIANANE(endo,endo-2,5-diaminonorbornane)为手性骨架的新型铬-salen配合物,并将其应用于Danishefsky's二烯与各种醛的杂Diels-Alder反应。该反应以高产率和对映选择性(高达 96% ee)得到相应的 2-取代的 2,3-二氢-4H-吡喃-4-酮。已经研究了配合物的不同抗衡阴离子对反应性和对映选择性的影响。除了Danishefsky的二烯之外,反应性较低的1-甲氧基丁二烯与苯甲醛和乙醛酸乙酯的反应也可以通过铬催化剂进行。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)