Organocatalyzed Reduction of Tertiary Phosphine Oxides
作者:Marie-Luis Schirmer、Stefan Jopp、Jens Holz、Anke Spannenberg、Thomas Werner
DOI:10.1002/adsc.201500762
日期:2016.1.7
A novel selective catalytic reduction method of tertiaryphosphineoxides to the corresponding phosphines has been developed. Notably, the reaction proceeds smoothly with low catalyst loadings of 1–5 mol% even at low temperature (70 °C). Under the optimized conditions various phosphineoxides could be selectively reduced and the desired phosphines were usually obtained in excellent yields above 90%
Conversion of phosphinic into phosphinous esters through nickelocene reduction–complexation of phosphinothioic O-esters. A new synthesis of carbon–phosphorus heterocycles
作者:François Mathey、François Mercier
DOI:10.1039/c39800000191
日期:——
A new procedure for reducing a phosphinate (LO) into the corresponding phosphinite (L) includes the following steps: LO → LS → CpNi(I)L → NiL4→ L (Cp = cyclopentadiene); such a scheme is illustrated by the syntheses of 2-phenyl-1,2-oxaphospholane and 2-phenylisophosphindoline 2-oxide.
2-Phenylisophosphindole 2-oxide (3) was generated as a reactive intermediate by the dehydrobromination of r-1-bromo-t-2-phenylisophosphindoline 2-oxide. The existence of 3 was confirmed by trapping with various dienophiles as the Diels-Alder adducts. The stereochemistry of the [4 + 2]π cycloaddition was found to be stereospecific giving endo products with the phosphoryl group syn to the approaching