The author of 《Synthesis of N-aryl β-amino acid derivatives via Cu(II)-catalyzed asymmetric 1,4-reduction in air》 were Li, Min; Xia, Hong-Feng; Yang, Li-Yao; Hong, Tao; Xie, Lin-Jie; Li, Shijun; Wu, Jing. And the article was published in RSC Advances in 2019. Electric Literature of C38H28O4P2 The author mentioned the following in the article:
In the presence of the inexpensive and stable stoichiometric reductant polymethylhydrosiloxane (PMHS) as well as certain amounts of appropriate alc. and base additives, the non-precious metal copper-catalyzed asym. 1,4-hydrosilylation of β-aryl or β-alkyl-substituted N-aryl β-enamino esters was well realized to afford a diverse range of N-aryl β-amino acid esters in high yields and excellent enantioselectivities (26 examples, 90-98% ee). This approach tolerated the handling of both catalyst and reactants in air without special precautions. The chiral products obtained were successfully converted to the corresponding enantiomerically enriched β-lactam and unprotected β-amino acid ester, which highlighted the synthetic utility of the developed catalytic procedure. In the experimental materials used by the author, we found (S)-5,5′-Bis(diphenylphosphino)-4,4′-bi-1,3-benzodioxole(cas: 210169-54-3Electric Literature of C38H28O4P2)
(S)-5,5′-Bis(diphenylphosphino)-4,4′-bi-1,3-benzodioxole(cas: 210169-54-3) is a chelating ligand used to prepare coordination complex catalysts, such as its use in Pd catalysts for the enantioselective synthesis of spiro- or benzofused hetereocycles with exocyclic olefins via enantioselective intramolecular dearomative Heck reaction of indoles, benzofurans, pyrroles and furans.Electric Literature of C38H28O4P2
Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis