A New and Convenient Asymmetric Synthesis of α-Amino- and α-Alkyl-α-aminophosphonic Acids Using <i>N</i>-<i>tert</i>-Butylsulfinyl Imines as Chiral Auxiliaries
作者:Chengye Yuan、Qianyi Chen
DOI:10.1055/s-2007-990872
日期:2007.12
successfully at room temperature with potassium carbonate as base to afford α-amino- and α-alkyl-α-amino- N-( TERT-butylsulfinyl)phosphonates in good to excellent chemical yield and diastereoselectivity. The major diastereo-mers were separated and smoothly converted into enantiopure α-amino- and α-alkyl-α-aminophosphonic acids.
Asymmetric Aldol–Tishchenko Reaction of Sulfinimines
作者:Vera M. Foley、Christina M. McSweeney、Kevin S. Eccles、Simon E. Lawrence、Gerard P. McGlacken
DOI:10.1021/acs.orglett.5b02919
日期:2015.11.20
Methods for the preparation of 1,3-amino alcohols and their derivatives containing two stereogenic centers usually involve a two-step installation of the chiral centers. An aldol–Tishchenkoreaction of chiral sulfinimines which involves the first reported reduction of a C═N in this type of reaction is described. Two and even three chiral centers can be installed in one synthetic step, affording anti-1
A Facile Synthesis of Chiral 4-(<i>tert</i>-Butylsulfinylamino)-2-oxophosphonates and Their Conversion into 5,5-Disubstituted 2-Benzylidene-3-oxopyrrolidines
作者:Chengye Yuan、Qianyi Chen
DOI:10.1055/s-2008-1032127
日期:——
The addition of the dianion derived from 2-oxophosphonates to chiral N-( TERT-butylsulfinyl)ketimines or -aldimine under mild reaction conditions afforded 4-( TERT-butylsulfinylamino)-2-oxoalkylphosphonates with good to excellent diastereoselectivity. The latter was then converted into an enantiopure 5,5-disubstituted 2-(dimethoxyphosphoryl)pyrrolidin-3-one via an intramolecular N-H insertion. Subsequent
Diastereoselective indium-mediated allylation of N-tert-butanesulfinyl ketimines: easy access to asymmetric quaternary stereocenters bearing nitrogen atoms
作者:Juan Alberto Sirvent、Francisco Foubelo、Miguel Yus
DOI:10.1039/c2cc17493f
日期:——
Indium-mediated allylation of N-tert-butanesulfinyl ketimines afforded in high yields and diastereoselectivities homoallylic amine derivatives with the nitrogenatom bonded to a quaternary stereocenter.