Greszler SN, Johnson JS. Diastereoselective synthesis of pentasubstituted gamma-butyrolactones from silyl glyoxylates and ketones through a double Reformatsky reaction.
Angew Chem Int Ed Engl 2009;
48:3689-91. [PMID:
19373816 DOI:
10.1002/anie.200900215]
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Abstract
Three contiguous stereocenters can be established with remarkable diastereoselectivity in a double Reformatsky sequence. Densely functionalized gamma-butyrolactones were assembled rapidly by this approach, in which a ketone is used as the terminal electrophile (see scheme). Secondary transformations of the lactone products enhance their synthetic utility. R(1) = Me, H; R(2) = alkyl, aryl, CF(3); Bn = benzyl, TBS = tert-butyldimethylsilyl.
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