N–H insertion reactions of rhodium carbenoids. Part 1. Preparation of α-amino acid and α-aminophosphonic acid derivatives
作者:Enrique Aller、Richard T. Buck、Martin J. Drysdale、Leigh Ferris、David Haigh、Christopher J. Moody、Neil D. Pearson、J. Bobby Sanghera
DOI:10.1039/p19960002879
日期:——
Rhodium(II) acetate-catalyseddecomposition of diazophenylacetates 1 and 3 in the presence of a range of N–H compounds results in an N–H insertion reaction of the intermediate carbenoids and formation of N-substituted phenylglycine derivatives 2 and 4. The corresponding reactions of dimethyl α-diazobenzylphosphonate 5 constitute a simple route to aminophosphonates 6.
Nucleophilic Carbene-Mediated Hydrophosphonylation of Aldimines
作者:Guang-Fen Du、Lin He、Zhi-Hua Cai、Bin Dai
DOI:10.1055/s-0031-1289690
日期:2012.3
Aldimines undergo efficient hydrophosphonylation reactions with dimethyl phosphite in the presence of nucleophilic heterocyclic carbenes (NHCs) as organocatalysts to give the corresponding (α-aminoalkyl)phosphonates in moderate-to-excellent yields.
A highly efficient Mukaiyama aldol reaction between ketones and trimethylsilyl enolates in the presence of potassium alkoxide–crown ethercomplexes as Lewis base catalysts (0.3–5 mol %), which minimized the competing retro-aldol reaction, was developed. These catalysts promoted other addition reactions of trimethylsilyl reagents to ketones and aldimines, such as silyltrifluoromethylation, silylcyanation