Yin, Liang published the artcileA Facile Pathway to Enantiomerically Enriched 3-Hydroxy-2-Oxindoles: Asymmetric Intramolecular Arylation of α-Keto Amides Catalyzed by a Palladium-DifluorPhos Complex, Recommanded Product: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, the publication is Angewandte Chemie, International Edition (2011), 50(33), 7620-7623, S7620/1-S7620/90, database is CAplus and MEDLINE.
The first catalytic, enantioselective intramol. aryl-transfer reaction of aryl triflates to ketones has been developed, providing 3-hydroxy-2-oxindoles, e.g., I, from α-keto amides, e.g., II, in 82-99% ee. Initial extension of the methodol. to the synthesis of 4-hydroxydihydroquinolin-2-ones is also explored. This method features overall practicality, including substrate stability and accessibility (protecting-group free) plus no need for the use of stoichiometric amounts of metals.
Angewandte Chemie, International Edition published new progress about 503538-69-0. 503538-69-0 belongs to dioxole, auxiliary class (Atropisomeric Bisphosphine Ligands, name is (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, and the molecular formula is C7H13ClNNaO5S, Recommanded Product: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole.
Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem