Readily available (S)-proline-derived organocatalysts for the Lewis acid-mediated Lewis base-catalyzed stereoselective aldol reactions of activated thioesters
phosphinyl oxide groups were easily synthesized in a straightforward procedure by reaction of readily available proline-based scaffolds and phosphinoyl chlorides. The newly synthesized derivatives were employed (0.1 mol equiv) as organocatalysts in the Lewis acid-mediated Lewis base-promoted direct stereoselectivealdolreactions of activated thioesters with aromatic aldehydes, carried out in the presence
Cleavage of PO in the Presence of P-N: Aminophosphine Oxide Reduction with In Situ Boronation of the P<sup>III</sup>Product
作者:Niall P. Kenny、Kamalraj V. Rajendran、Elizabeth V. Jennings、Declan G. Gilheany
DOI:10.1002/chem.201302907
日期:2013.10.11
In contrast to tertiary phosphine oxides, the deoxygenation of aminophosphine oxides is effectively impossible due to the need to break the immensely strong and inert PO bond in the presence of a relatively weak and more reactive PN bond. This long‐standing problem in organophosphorus synthesis is solved by use of oxalyl chloride, which chemoselectively cleaves the PO bond forming a chlorophosphonium