One-pot reaction of 2-formylbenzoates, hexamethyldisilazane, and diethyl phosphite in the presence of Yb(OTf)3: Synthesis of 3-phosphonate phthalides
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Add time:09/07/2019 Source:sciencedirect.com
Reaction of 2-formylbenzoates with hexamethyldisilazane and diethyl phosphite in the presence of Yb(OTf)3 proceeded smoothly at room temperature to afford addition adducts, which were readily cyclized to 3-phosphonate phthalides by adding trifluoroacetic acid (TFA). The reactions employing Sc(OTf)3 instead of Yb(OTf)3 produced 3-phosphonate isoindolinones without addition of TFA.
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