Journal
TETRAHEDRON LETTERS
Volume 44, Issue 4, Pages 663-666Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(02)02662-X
Keywords
asymmetric dihydroxylation; butenolides
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Both enantiomers of 3-benzoyloxymethylisobenzofuranone have been obtained in good yield in six steps from phthalaldehyde using a D-xylose derivative as a chiral protecting group. The two chiral heterocycles are gamma-hydroxymethyl-alpha,beta-butenolide analogues having a benzene ring in positions 2 and 3. The key step was the dihydroxylation using both OsO4 and AD-mix developed by Sharpless. The asymmetric dihydroxylation using AD-mix required a double diastereoselectivity and gave excellent diastereoisomeric excess. (C) 2003 Elsevier Science Ltd. All rights reserved.
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