Chiral Bicyclic Guanidine-Catalyzed Enantioselective Reactions of Anthrones
作者:Juan Shen、Thanh Truc Nguyen、Yong-Peng Goh、Weiping Ye、Xiao Fu、Junye Xu、Choon-Hong Tan
DOI:10.1021/ja064636n
日期:2006.10.1
catalyst for reactions between anthrones and various dienophiles. The catalyst can tolerate a range of substituents and substitution patterns, making several anthrone derivatives suitable for this reaction. Both Diels-Alder and Michael adducts were obtained in excellent yields, high regioselectivities, and high enantioselectivities. This is the first case of a highly enantioselective base-catalyzed anthrone
手性双环胍 1 被发现是蒽酮和各种亲二烯体之间反应的极好催化剂。该催化剂可以耐受一系列取代基和取代模式,使几种蒽酮衍生物适用于该反应。Diels-Alder 和 Michael 加合物均以优异的产率、高区域选择性和高对映选择性获得。这是高度对映选择性碱催化蒽酮 Diels-Alder 反应的第一个案例。
Asymmetric organocatalytic anthrone additions to activated alkenes
作者:Alex Zea、Andrea-Nekane R. Alba、Natalia Bravo、Albert Moyano、Ramon Rios
DOI:10.1016/j.tet.2011.02.032
日期:2011.4
Asymmetric organocatalyticadditions of anthrones to activated alkenes are discussed. The reaction between anthrone or dithranol and α,β-unsaturated aldehydes is catalyzed by diphenylprolinol trimethylsilyl ether in toluene at −40 °C, giving the Michael adducts with good yields and enantioselectivities. Bifunctional amino-thioureas efficiently catalyze the additions of anthrones to both nitroalkenes and maleimides
Bifunctional Thiourea-Catalyzed Asymmetric Addition of Anthrones to Maleimides
作者:Alex Zea、Guillem Valero、Andrea-Nekane R. Alba、Albert Moyano、Ramon Rios
DOI:10.1002/adsc.201000031
日期:——
For the first time, the addition of anthrones to maleimides catalyzed by bifunctional thiourea catalysts is reported. The thiourea moiety is able to activate the maleimide and the tertiary amine deprotonates the anthrone, furnishing the final Diels–Alder or Michael adducts in excellent yields and enantioselectivities.