large rate differences on variation of the anion are all characteristics of the new Ru Lewisacid [CpRu((S,S)-biphop-F)]+ (biphop-F=(C6 F5 )2 POCH2 (Ph)CH2 (Ph)OP(C6 F5 )2 ). The structure of complex 1 (L=methacrolein, Y=SbF6 ) provides evidence for a cooperative binding of the dienophile by both the Lewisacid and the anion.
易产生,在室温下溶液中稳定,在Diels-Alder反应中具有高对映选择性,有效的催化剂回收率以及阴离子变化率大的差异都是新的Ru Lewis酸[CpRu((S,S)- biphop-F)] +(biphop-F =(C 6 F 5)2 POCH 2(Ph)CH 2(Ph)OP(C 6 F 5)2)。配合物1的结构(L =甲基丙烯醛,Y = SbF 6)提供了路易斯酸和阴离子对亲二烯体的协同结合的证据。
A New Powerful and Practical BLA Catalyst for Highly Enantioselective Diels−Alder Reaction: An Extreme Acceleration of Reaction Rate by Brønsted Acid
Enantioselective Diels-Alder reaction of .alpha.-bromo-.alpha.,.beta.-enals with dienes under catalysis by CAB
作者:Kazuaki Ishihara、Qingzhi Gao、Hisashi Yamamoto
DOI:10.1021/jo00076a070
日期:1993.11
Kuendig, Ernst Peter; Bourdin, Bernadette; Bernardinelli, Gerald, Angewandte Chemie, 1994, vol. 106, # 18, p. 1931 - 1934
作者:Kuendig, Ernst Peter、Bourdin, Bernadette、Bernardinelli, Gerald
DOI:——
日期:——
Catalytic Enantioselective Diels−Alder Reaction in Ionic Liquid via a Recyclable Chiral In(III) Complex
作者:Fan Fu、Yong-Chua Teo、Teck-Peng Loh
DOI:10.1021/ol062481i
日期:2006.12.1
A recyclable, air-and moisture- stable chiral indium complex in [hmim][ PF6-] ionic liquid has been developed. The cycloaddition of a variety of cyclic and open- chained dienes to 2-methacrolein and 2- bromoacrolein resulted in good yields and excellent enantioselectivities ( up to 98% ee). Moreover, the chiral In( III) complex can be reused for seven successive cycles with comparable enantioselectivities and yields without loss of catalytic activity.