J. Mcnulty et al., Selective addition of Grignard reagents to 2,3-O-isopropylidene bis-Weinreb tartaric acid amide, TETRAHEDR L, 42(33), 2001, pp. 5609-5612
Controlled addition of Grignard reagents to tartaric acid derived bis-Weinr
eb amide 3 provides a facile, direct entry to desymmetrized 1,4-functionali
zed-syn-2.3-diol intermediates 4 and to C-2-symmetrical 1,4-diketones 5. Th
e synthetic versatility of this method is exemplified by short syntheses of
the natural plant growth regulator 10 and the synthetically valuable cyclo
octene derivative 13. (C) 2001 Elsevier Science Ltd. All rights reserved.