New C2-symmetric tetrafluorobenzobarreleneligands were prepared and applied successfully to the rhodium-catalyzedasymmetric addition of arylboronic acids to aromatic aldehydes giving chiral diarylmethanols in high yield with high enantioselectivity.
Evaluation of Enantiopure <i>N</i>-(Ferrocenylmethyl)azetidin-2-yl(diphenyl)methanol for Catalytic Asymmetric Addition of Organozinc Reagents to Aldehydes
作者:Min-Can Wang、Qing-Jian Zhang、Wen-Xian Zhao、Xiao-Dan Wang、Xue Ding、Tao-Tao Jing、Mao-Ping Song
DOI:10.1021/jo701943x
日期:2008.1.1
catalytic asymmetric addition of organozinc reagents to aldehydes. The asymmetric ethylation, methylation, arylation, and alkynylation of aldehydes achieved enantioselectivity of up to 98.4%, 94.1%, 99.0%, and 84.6% ee, respectively, in the presence of a catalytic amount of chiral N-(ferrocenylmethyl)azetidin-2-yl(diphenyl)methanol. Our results demonstrated further that the four-membered heterocycle-based
New Enantiopure <i>N</i>-Ferrocenylmethyl Azetidin-2-yl(diphenyl)methanol and Its Application in Catalytic Asymmetric Ethylation and Arylation of Arylaldehydes
作者:Min-Can Wang、Mao-Ping Song、Wen-Xian Zhao、Xiao-Dan Wang
DOI:10.1055/s-2006-956474
日期:2006.12
A novel, facile and practical approach to preparation of new enantiopure N-ferrocenylmethyl azetidin-2-yl(diphenyl)methanol has been developed. In the presence of a catalytic amount of the chiral N-ferrocenylmethyl azetidin-2-yl(diphenyl)methanol, the enantioselective ethylation and arylation of arylaldehydes afforded addition products with enantioselectivities of up to 98.4% ee and 95.7% ee, respectively.
我们开发了一种新颖、简便和实用的方法来制备新的对映体纯 N-二茂铁基甲基氮杂环丁烷-2-基(二苯基)甲醇。在手性 N-二茂铁基甲基氮杂环丁烷-2-基(二苯基)甲醇的催化下,芳基醛的对映体选择性乙基化和芳基化得到了加成产物,其对映体选择性分别高达 98.4% ee 和 95.7%ee。
Novel Axially Chiral Phosphine Ligand with a Fluoro Alcohol Moiety for Rh-Catalyzed Asymmetric Arylation of Aromatic Aldehydes
作者:Satoshi Morikawa、Kyosuke Michigami、Hideki Amii
DOI:10.1021/ol100697a
日期:2010.6.4
A new chiral phosphine ligand (R)-1 possessing a fluoroalcohol moiety was prepared. The (R)-1-coordinated Rh(I) complex showed an excellent catalytic activity for asymmetric 1,2-addition of arylboronic acids to aldehydes to afford highly enantioenriched diarylmethanols. The fluoroalcohol moiety in ligand (R)-1 plays a pivotal role for the high enantioselectivity of the present Rh(I)-catalyzed transformation.
Catalytic asymmetric aryl transfer: highly enantioselective preparation of (R)- and (S)-diarylmethanols catalyzed by the same chiral ferrocenyl aziridino alcohol
作者:Min-Can Wang、Xiao-Dan Wang、Xue Ding、Zhi-Kang Liu
DOI:10.1016/j.tet.2008.01.040
日期:2008.3
Highly enantioselective arylations of arylaldehydes using arylboronic acids as aryl resource were realized in the presence of a catalytic amount of (2S)-1-ferrocenylmethylaziridin-2-yl(diphenyl)methanol. In addition, the R or S enantiomers of a series of given diarylmethanols can be easily obtained in high yields with excellent enantioselectivities simply by the reverse combinations of both reaction partners. A possible transition state for the catalytic asymmetric addition has been proposed on the basis of previous studies. (c) 2008 Published by Elsevier Ltd.