170209-09-3Relevant articles and documents
Asymmetric addition reaction of phenyllithium to 1,2-ethylenediimine with the aid of a chiral ligand
Taniyama, Daisuke,Kanai, Motomu,Iida, Akira,Tomioka, Kiyoshi
, p. 1705 - 1707 (1997)
The reaction of N,N'-bis(4-methoxyphenyl)ethylenediimine with phenyllithium, with the mediation of a chiral ligand, provided the addition products, (1R,2R)-N,N'-bis(4-methoxyphenyl)-1,2-diphenylethanediamine of 67% ee and the meso-product, in a ratio of 41:59. The net reaction involves sequential double additions of phenyllithium. In the first addition a new chiral center is created, but with rather poor selectivity, and in the second addition kinetic discrimination takes place, giving the chiral double addition product.
Highly Enantioselective Imino Pinacol Coupling Leading to the Synthesis of 1,2-Diphenylethylenediamine Derivatives
Shimizu, Makoto,Iida, Toyoshi,Fujisawa, Tamotsu
, p. 609 - 610 (2007/10/03)
Enantioselective imino pinacol coupling of p-anisylbenzalimine was promoted by the use of Zn-Cu couple in the presence of (+)-camphorsulfonic acid to give (R,R)-1,2-diphenylethylenediamine derivative in high enantiomeric purity.
Stereocontrol in the reduction of 1,2-diimine with an oxazaborolidine catalyst. Highly stereoselective preparation of (R,R)-1,2-diphenylethylenediamine
Shimizu, Makoto,Kamei, Mie,Fujisawa, Tamotsu
, p. 8607 - 8610 (2007/10/02)
Highly enantioselective reduction of 1,2-bis(p-methoxyphenylimino)-1,2-diphenylethane was conducted even with 0.5 mol% of new oxazaborolidine derived from L-threonine and a stoichiometric amount of BH3·THF to give 1,2-diphenylethylenediamine derivative in excellent enantiomeric purity. The subsequent deprotection of nitrogen atoms afforded (R,R)-1,2-diphenylethylenediamine in enantiomerically pure form.