C(21)−C(40) of Tetrafibricin via Metal Catalysis: Beyond Stoichiometric Chiral Reagents, Auxiliaries, and Premetalated Nucleophiles
摘要:
The C(21)-C(40) fragment of fibrinogen receptor inhibitor tetrafibricin was prepared in 12 steps from propane diol (longest linear sequence). In this approach, 6 C-C bonds are formed via asymmetric iridium catalyzed transfer hydrogenative carbonyl allylation and 2 C=C bonds are formed via Grubbs olefin cross-metathesis.
Total synthesis of (+)-phorboxazole A, a potent cytostatic agent from the sponge Phorbas sp.
作者:Gerald Pattenden、Miguel A. González、Paul B. Little、David S. Millan、Alleyn T. Plowright、James A. Tornos、Tao Ye
DOI:10.1039/b308305e
日期:——
A convergent total synthesis of phorboxazole A (1a), from the C(3-19), C(20-27) and C(33-46) fragments 5, 4 and 91, respectively, concentrating on stereocontrolled formation of the bonds at C(2-3), C(19-20) and C(27-28), is described. Although a coupling reaction between a macrolide ketone and the side chain substituted sulfone, at C(27-28) was not successful, a Wadsworth-Emmons olefination involving
Fluorous Mixture Synthesis of Four Stereoisomers of the C21-C40 Fragment of Tetrafibricin
作者:Dennis Curran、Kai Zhang
DOI:10.1055/s-0029-1219376
日期:2010.3
Fourstereoisomers of the C21-C40 fragment are synthesized in a single exercise with the aid of fluorous tagging to encode configurations at C37 and C33. After demixing and detagging, the isomers were found to have substantially identical (1)H NMR spectra. However, there were some small but reliable differences in their (13)C NMR spectra.
Synthetic studies towards phorboxazole A. A convergent synthesis of the C31C46 polyene oxane-hemiacetal side chain
作者:Gerald Pattenden、Alleyn T Plowright、James A Tornos、Tao Ye
DOI:10.1016/s0040-4039(98)01258-1
日期:1998.8
A convergent and stereoselective synthesis of the C31-C46 side chain unit in the marine natural product phorboxazole A, which accommodates five asymmetric centres, three carbon-to-carbon double bonds and an oxane-hemiacetal unit, is described. (C) 1998 Elsevier Science Ltd. All rights reserved.
C(21)−C(40) of Tetrafibricin <i>via</i> Metal Catalysis: Beyond Stoichiometric Chiral Reagents, Auxiliaries, and Premetalated Nucleophiles
作者:Esa T. T. Kumpulainen、Byungsoo Kang、Michael J. Krische
DOI:10.1021/ol200735r
日期:2011.5.6
The C(21)-C(40) fragment of fibrinogen receptor inhibitor tetrafibricin was prepared in 12 steps from propane diol (longest linear sequence). In this approach, 6 C-C bonds are formed via asymmetric iridium catalyzed transfer hydrogenative carbonyl allylation and 2 C=C bonds are formed via Grubbs olefin cross-metathesis.