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Conditions milder than those previously reported are shown to be generally applicable to the Pt-catalyzed insertion of non-carbonyl-stabilized diazoalkanes into B 2 pin 2 . Selective transformation of one (pinacolato)boryl unit in the products is enabled by rapid, low-temperature deboronation in the presence of a Lewis base and genesis of a highly reactive B-stabilized carbanion.
A convenient route to a benzo-fused amino indanol chiral controller is disclosed. The synthesis is based on a newly optimized entry to 3H-benz(e)indene that can be performed on decagram scale with no purification of intermediates. Subsequent oxidation, classical resolution, and Ritter steps give the target synthon in >98% ee. The resolution features (S)-naproxen as an inexpensive and highly crystalline...
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