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Beilstein J. Org. Chem. 2014, 10, 1220–1227, doi:10.3762/bjoc.10.120
Graphical Abstract
Scheme 1: Synthesis of alkoxy dibenzooxaphosphorin oxides by C(sp2)–H activation/C–O formation.
Scheme 2: Preparation of 2-(aryl)arylphosphonic acid monoethyl esters.
Scheme 3: A variety of organic acids and monoprotected amino acids as ligands.
Scheme 4: Cyclization of 2-arylphenylphosphonic acid monoethyl esters.
Scheme 5: Cyclization of 2-(aryl)arylphosphonic acid monoethyl esters.
Scheme 6: Preparation of 1a-[D5].
Scheme 7: Preparation of 1a-[D1].
Scheme 8: Studies with isotopically labelled compounds.
Scheme 9: A plausible mechanism.