286454-86-2Relevant articles and documents
Asymmetric kinetic resolution of sulfides for the construction of unsymmetric sulfides and chiral 3,3-disubstituted oxindoles
Wang, Kaiye,Xiang, Yanan,Shi, Zhujun,Wang, Hongyu,Li, Na,Tang, Bo
, p. 6351 - 6354 (2019/07/10)
A range of 3,3-disubstituted oxindoles accessed using para-quinone methides derived from isatins with thiols were used for the formation of unsymmetrical disulfides, and 3,3-disubstituted oxindoles with a chiral quaternary carbon center and unsymmetric di
Novel chiral sulfinamide phosphines: Valuable precursors to chiral β-aminophosphines
Chen, Peng,Su, Xiao,Zhou, Wei,Xiao, Yuanjing,Zhang, Junliang
, p. 2700 - 2706 (2016/05/10)
Starting from commercially available aldehyde and chiral tert-butanesulfinamide, a series of chiral sulfinamide phosphines (Xiao-Phos) were synthesized via a two-step condensation-nucleophilic addition procedure. In most cases, nucleophilic addition of th
Tunable Bifunctional Phosphine-Squaramide Promoted Morita-Baylis-Hillman Reaction of N-Alkyl Isatins with Acrylates
Dong, Ze,Yan, Chao,Gao, Yongzhi,Dong, Chune,Qiu, Guofu,Zhou, Hai-Bing
, p. 2132 - 2142 (2015/06/23)
A series of highly tunable bifunctional phosphine-squaramide H-bond donor organocatalysts 6 has been synthesized from inexpensive and commercially available β-amino alcohols in moderate yields. Catalyst 6 can efficiently promote the asymmetric Morita-Baylis-Hillman (MBH) reaction of N-alkyl isatins with acrylate esters providing the chiral 3-substituted 3-hydroxy-2-oxindoles in good yields and enantioselectivities (up to 93 yield and 95 ee), in which the challenging substrate tert-butyl acrylate 9d, provided the best ee value to date. Moreover, this methodology was applied successfully in the synthesis of chiral cyclic spiropyrrolizidineoxindole and γ-butyrolactone derivatives without enantioselectivity deterioration. The possible mechanism of this MBH reaction was also investigated by 31PNMR, ESI-MS and KIE studies. The KIE experiments show that the electrophilic addition of N-methyl isatin to the complex of acrylate ester and phophine-squaramide is the rate-determing step of the asymmetric MBH reaction.
Enantioselective copper-catalyzed 1,4-addition of dialkylzincs to enones followed by trapping with allyl iodide derivatives
Kawamura, Kenjiro,Fukuzawa, Hitomi,Hayashi, Masahiko
scheme or table, p. 640 - 647 (2011/08/06)
Enantioselective copper-catalyzed 1,4-addition of dialkylzincs to enones proceeded in the presence of 0.1 mol% of Cu(OTf)2 and 0.25 mol% of an N,N,P-ligand containing a quinoline moiety to afford the corresponding conjugated adducts in 99%ee. The intermediate zinc enolates were trapped with substituted allyl iodides to give disubstituted ketones with high diastereoselectivity and enantioselectivity.
Synthesis of chiral aminophosphines from chiral aminoalcohols via cyclic sulfamidates
Guo, Rongwei,Lu, Shuiming,Chen, Xuanhua,Tsang, Chi-Wing,Jia, Wenli,Sui-Seng, Christine,Amoroso, Dino,Abdur-Rashid, Kamaluddin
supporting information; experimental part, p. 937 - 940 (2010/05/02)
(Chemical Equation Presented) Protic aminophosphines with multiple chiral centers were synthesized in good yields and high purity by the nucleophilic ring-opening of N-protected cyclic sulfamidates with metal phosphides, followed by hydrolysis and deprote
Asymmetrie [3+2] cycloadditions of allenoates and dual activated olefins catalyzed by simple bifunctional N-acyl aminophosphines
Xiao, Hua,Chai, Zhuo,Zheng, Chang-Wu,Yang, Ying-Quan,Liu, Wen,Zhang, Jun-Kang,Zhao, Gang
supporting information; experimental part, p. 4467 - 4470 (2010/07/16)
(Figure Presented) Bifunctional catalyst: Simple bifunctional N-Acyl aminophosphines such as 1 were developed to catalyze the first asymmetric [3+2] cycloaddition between allenoates and dual activated olefins. The cycloaddi- tion reactions afford multifun
Novel N,N,P-tridentate ligands for the highly enantioselective copper-catalyzed 1,4-addition of dialkylzincs to enones
Kawamura, Kenjiro,Fukuzawa, Hitomi,Hayashi, Masahiko
supporting information; experimental part, p. 3509 - 3512 (2009/05/07)
(Chemical Equation Presented) Use of 0.25 mol % of the N,N,P-tridentate ligand containing the 2-quinolyl moiety (1 and 2) and 0.1 mol % of Cu(OTf) 2 enabled the enantioselective 1,4-addition of dialkylzincs to cyclic enones to produce 1,4-adduc
Versatile chiral bidentate ligands derived from α-amino acids: Synthetic applications and mechanistic considerations in the palladium- mediated asymmetric allylic substitutions
Saitoh, Akihito,Achiwa, Kazuo,Tanaka, Kiyoshi,Morimoto, Toshiaki
, p. 4227 - 4240 (2007/10/03)
A new class of chiral amidine-phosphine hybrid ligands 7a,b, which are readily accessible from the corresponding α-amino acids, were developed. A versatility for construction of new ligands is desirable, by which a variety of reactions and substrates become applicable. Indeed, a variety of modifications, such as exchange reactions to other amino groups in the amidine skeleton and the production of other types of ligands, are possible using the precursor compounds of 7a. Thus, novel chiral ligands 7c,d, 8, 11, and 13, which provide sterically and electronically different chiral circumstances, were prepared and used for the palladium-mediated asymmetric allylic substitutions of both acyclic and cyclic compounds. In these reactions, high levels of asymmetric induction were achieved for both substrates. A marked advancement of reactivity and enantioselectivity in palladium-catalyzed asymmetric allylations of 1,3-diphenylpropen-2-yl pivalate 14a was attained by examination of electronic substituent effects in a new series of chiral P-N and S-N hybrid ligands 8 and 11. Mechanistic views concerning the enantiodiscriminating step were demonstrated, in which a good correlation between a novel Pr/Mr concept and the absolute configuration of allylation products are discussed for the prediction of enantioselecting direction. The use of ketene silyl acetals as nucleophiles was investigated and compared with the corresponding harder anionic carbon nucleophiles. The former nucleophiles afforded higher enantioselectivity in asymmetric allylic transformations of 14a.