Ruthenium-catalysed asymmetric transfer hydrogenation of N-(tert-butanesulfinyl)imines
作者:David Guijarro、Óscar Pablo、Miguel Yus
DOI:10.1016/j.tetlet.2009.07.044
日期:2009.9
l is a very efficient catalyst for the asymmetrictransferhydrogenation of (R)-N-(tert-butanesulfinyl)ketimines in isopropanol. By carefully removing all possible moisture from the reaction medium, chiral primary amines with very high optical purities (up to >99% ee) can be easily prepared in excellent yields by the diastereoselective reduction of the imines followed by removal of the sulfinyl group
Methyltrioxorhenium/urea hydrogen peroxide catalyzed oxidation of N-sulfinyl imines: A mild and highly efficient access to N-sulfonyl aldimines, ketimines and α-ketiminoesters
作者:Yu Tan、Ru-Lin Ma、Hua Lin、Xing-Wen Sun
DOI:10.1016/j.tetlet.2020.152587
日期:2020.12
A mild and highly efficient access to N-sulfonyl imines through the oxidation of corresponding N-tert-butylsulfinyl imines and N-p-tosyl-sulfinyl imines with UHP in the presence of catalytic amount MTO was developed. Under mild reaction conditions, this highly selective reaction, provides a general and efficient access to N-sulfonyl aldimines, ketimines and α-ketiminoesters in excellent yield. The
2-amino alcohols by the addition of 3-chloro- and 3-methoxymethoxy- allenylzincs to chiral tert-butylsulfinylimines is described. The methodology is applicable to the preparation of alkynyl 2-amino-1,3-diols (O,N,O stereotriads) usingα-alkoxy tert-butylsulfinylimines as chiral starting materials. The scope and limitations of the methodology along with recent applications to the efficient asymmetric syntheses
Exploiting the Bis-Nucleophilicity of α-Aminoboronates: Copper-Catalyzed, Intramolecular Aminoalkylations of Bromobenzoyl Chlorides
作者:Aaron M. Dumas、Adrian J. Sieradzki、Liam J. Donnelly
DOI:10.1021/acs.orglett.6b00586
日期:2016.4.15
containing adjacent nucleophilic centers. We have developed an acylation/arylation reaction using 2-bromobenzoyl chlorides as bis-electrophiles that harnesses the nucleophilicity of both positions, leading to isoindolinones. The reactions proceed under mild conditions via an intramolecular, Cu-catalyzed sp3–sp2 coupling, giving products in up to 95% yield. These conditions enable arylation of α,α-disubstituted
Mechanism and Origins of Stereoselectivity of the Aldol-Tishchenko Reaction of Sulfinimines
作者:Aneta Turlik、Kaori Ando、Pamela Mackey、Emma Alcock、Mark Light、Gerard P. McGlacken、K. N. Houk
DOI:10.1021/acs.joc.0c02862
日期:2021.3.5
mechanism and origins of stereoselectivity in McGlacken’s aldol-Tishchenko reaction for the diastereoselectivesynthesis of 1,3-amino alcohols using Ellman’s t-butylsulfinimines as chiral auxiliaries. Variations of stereochemical outcome are dependent on the nature of the ketone starting materials used, and the aspects leading to these differences have been rationalized. The intramolecular hydride transfer