Journal
ORGANIC LETTERS
Volume 13, Issue 3, Pages 418-421Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol1027305
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- University of California, Davis
- American Chemical Society
- NIH/NIGMS [P41-GM0089153]
- 3M Corporation
- NSF
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A regio- and stereoselective cyclization between isatins and 5-methoxyoxazoles has been developed using catalytic titanium(IV) chloride (10 or 20 mol %) to afford spiro[3,3'-oxindoleoxazolines] in excellent yield (up to 99%) and diastereoselectivity (dr >99:1). Substitution at the 4-position of the oxazole controls nucleophilic attack to provide either the 2-oxazoline or 3-oxazoline spirocycle with excellent (>99:1) regiocontrol.
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