Insertion Reactions and Catalytic Hydrophosphination of Heterocumulenes using α-Metalated <i>N</i>,<i>N</i>-Dimethylbenzylamine Rare-Earth-Metal Complexes
作者:Andrew C. Behrle、Joseph A. R. Schmidt
DOI:10.1021/om300807k
日期:2013.3.11
dimethylbenzylamine) was probed through a series of stoichiometric insertion and catalytic hydrophosphination reactions. Both rare-earth-metal species inserted 3 equiv of various carbodiimides to form the corresponding homoleptic amidinates. α-La(DMBA)3 was also found to be a useful precatalyst for the room-temperature hydrophosphination of heterocumulenes to form phosphaguanidines, phosphaureas, and phosphathioureas
Reactions of isocyanates with primary and secondary phosphines without solvent at room temperature afforded the corresponding phosphinecarboxamide (RN(H)COPR'2) in excellent yields. This reaction system is applicable for isothiocyanates. The compounds newly obtained were fully characterized using multielement NMR spectroscopy. In addition, the molecular structure of Cl(CH2)2N(H)COPPh2 was studied by
Easily assembled, modular N,O-chelating ligands for Ta(V) complexation: a comparative study of ligand effects in hydroaminoalkylation with N-methylaniline and 4-methoxy-N-methylaniline
作者:Pierre Garcia、Philippa R. Payne、Eugene Chong、Ruth L. Webster、Benedict J. Barron、Andrew C. Behrle、Joseph A.R. Schmidt、Laurel L. Schafer
DOI:10.1016/j.tet.2013.04.070
日期:2013.7
The influence of structurally related N,O-chelating ligands with additional heteroatoms (N, O, P, S) on the reactivity of in situ generated tantalumcomplexes for the hydroaminoalkylation of amines has been explored. Reactivity was probed by evaluating the catalytic ability of these N,O-chelating systems with N-methylaniline and 4-methoxy-N-methylaniline substrates. Enhanced reactivity is observed
Zirconium complexes supported by multidentate aminophenolato ligands were synthesized and characterized. The catalytic activities of neutral zirconium complexes and their cationic derivatives in the hydrophosphination of alkenes as well as heterocumulenes have been investigated and compared. Neutralcomplex 1 bearing a multidentate amino mono(phenolato) ligand exhibited high activity in hydrophosphination
isocyanates/isothiocyanates with primary and secondary phosphines without solvent at room temperature afforded phosphinecarboxamide/phosphinecarbothioamide, respectively, in excellent yields. Furthermore, palladiumcomplex Pd(COD)Cl2 was allowed to react with Ph2PC(O)NHPh (1a) to afford [PdPh2PC(O)NHPh-κP}2Cl2] (3). On the other hand, the reaction of Pd(COD)Cl2 with 1 eq. of Ph2PC(S)NHPh (2a) afforded [PdCl2Ph2PC(S)NHPh-κP