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Synlett 2004(6): 1054-1058
DOI: 10.1055/s-2004-822895
DOI: 10.1055/s-2004-822895
LETTER
© Georg Thieme Verlag Stuttgart · New York
Intramolecular Chromium(II)-Catalyzed Pinacol Cross Coupling of 2-Methylene-α,ω-dicarbonyls [1]
Further Information
Received
11 February 2004
Publication Date:
25 March 2004 (online)
Publication History
Publication Date:
25 March 2004 (online)
Abstract
Using only 10% of CrCl2 as catalyst, manganese-powder as reducing agent and TMSCl as scavenger, 2-methylene-α,ω-dialdehydes and -ketones can be coupled to form cyclic diols diastereoselectively. The diastereomeric excess strongly depends on the ring size and the substituents of the ω-carbonyl group. The greater the ring size the higher diastereoselectivities are observed. In all cases cis-diols are preferentially formed.
Key words
chromium - catalysis - cross-coupling - cyclizations - pinacols
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