Synthesis of 14′,15′-dehydro-ritterazine Y via reductive and oxidative functionalizations of hecogenin acetate
摘要:
An analog of ritterazine Y was synthesized from hecogenin acetate in 23 steps via functional group manipulations of hecogenin acetate. Preparation of the north G and south Y units and the late stage Guo-Fuchs asymmetric coupling of the both units afforded the ritterazine Y analog. (C) 2012 Elsevier Inc. All rights reserved.
Synthesis of 14′,15′-dehydro-ritterazine Y via reductive and oxidative functionalizations of hecogenin acetate
摘要:
An analog of ritterazine Y was synthesized from hecogenin acetate in 23 steps via functional group manipulations of hecogenin acetate. Preparation of the north G and south Y units and the late stage Guo-Fuchs asymmetric coupling of the both units afforded the ritterazine Y analog. (C) 2012 Elsevier Inc. All rights reserved.
Synthesis of C14,15-Dihydro-C22,25-<i>epi</i> North Unit of Cephalostatin 1 via “Red-Ox” Modifications of Hecogenin Acetate
作者:Seongmin Lee、Daniel Jamieson、Philip L. Fuchs
DOI:10.1021/ol802122p
日期:2009.1.1
The C14,15-Dihydro-C22,25-epi north unit of cephalostatin1 has been synthesized in 11 operations from commercially available hecogenin acetate via multiple reductions and oxidations. The key transformations include (i) CrVI-catalyzed E-ring opening, (ii) C17 hydroxylation, and (iii) a base-triggered cyclization cascade.