Controlled oxidative addition of amino acid esters to Rh(I)
摘要:
The new sterically demanding phosphine 2-(di-o-tolylphosphino)phenol was prepared and used to create a series of esters with N-acylated amino acids. The phosphine-containing esters react within 30-60 min at room temperature with [(mu-Cl)Rh(cyclooctene)(2)](2) to give products of oxidative addition of the ester carbonyl-oxygen bond to the Rh center. The N-acyl carbonyl oxygen is bound to the Rh in these initial adducts, but is displaced upon addition of PMe3. Remarkably, both initial products and their PMe3 adducts are formed as single five-coordinate diastereomers in essentially quantitative yields. (C) 1999 Elsevier Science S.A. All rights reserved.
Controlled oxidative addition of amino acid esters to Rh(I)
摘要:
The new sterically demanding phosphine 2-(di-o-tolylphosphino)phenol was prepared and used to create a series of esters with N-acylated amino acids. The phosphine-containing esters react within 30-60 min at room temperature with [(mu-Cl)Rh(cyclooctene)(2)](2) to give products of oxidative addition of the ester carbonyl-oxygen bond to the Rh center. The N-acyl carbonyl oxygen is bound to the Rh in these initial adducts, but is displaced upon addition of PMe3. Remarkably, both initial products and their PMe3 adducts are formed as single five-coordinate diastereomers in essentially quantitative yields. (C) 1999 Elsevier Science S.A. All rights reserved.
Oxidative addition of the C–O bond of amino acid esters to Rh(I) forming chelating acyl complexes
作者:Douglas B Grotjahn、Camil Joubran
DOI:10.1016/j.ica.2004.05.028
日期:2004.7
Esters of N-acylated amino acids and the sterically demanding phosphine 2-(di-ortho-tolylphosphino)phenol react within 1 h at roomtemperature with the Rh(I) centers of [Cl(μ-Cl)Rh(cyclooctene)2]2 to give products of oxidative addition of the ester carbonyl–O bond. The N-acyl carbonyl oxygen is bound to the Rh in these initial adducts, but is displaced upon addition of PMe3, PhPMe2, NH2NMe2, or the