Total Synthesis and Biological Evaluation of Halipeptins A and D and Analogues
作者:K. C. Nicolaou、Dimitrios E. Lizos、David W. Kim、Daniel Schlawe、Rita G. de Noronha、Deborah A. Longbottom、Manuela Rodriquez、Mariarosaria Bucci、Giuseppe Cirino
DOI:10.1021/ja060064v
日期:2006.4.5
macrolactamization led to a mixture of halipeptins A (1a) and D (1d) and their analogues 3a, 3d (epimers at the indicated site) and 4a, 4d (epimers at the indicated site). The same route starting with D-Ala resulted in the exclusive formation of the epimeric halipeptinDanalogue 3d. The synthesized halipeptins, together with the previously constructed oxazoline analogues 5d and 6d, were subjected to biological
海洋衍生的 halipeptins A (1a) 和 D (1d) 及其类似物 3a、3d 和 4a、4d 是从构建块 10、13、14a 或 14d、15 和 16 开始合成的。 组装建筑物的第一个策略块,涉及大环内酰胺化反应形成 16 元环羟基硫代酰胺 52d 作为前体,提供了 halipeptin D 的表异亮氨酸类似物 (4d),而第二种方法涉及在大环内酰胺化之前形成噻唑啉,导致 halipeptins A 的混合物(1a) 和 D (1d) 及其类似物 3a、3d(指定位点的差向异构体)和 4a、4d(指定位点的差向异构体)。以 D-Ala 开始的相同途径导致差向异构 halipeptin D 类似物 3d 的独家形成。合成的 halipeptins,连同先前构建的恶唑啉类似物 5d 和 6d,
Total Synthesis of Halipeptins: Isolation of Halipeptin D and Synthesis of Oxazoline Halipeptin Analogues
作者:K. C. Nicolaou、Daniel Schlawe、David W. Kim、Deborah A. Longbottom、Rita G. de Noronha、Dimitrios E. Lizos、Rama Rao Manam、D. John Faulkner
DOI:10.1002/chem.200500624
日期:2005.10.21
isolation from the marine sponge Leiosella cf. arenifibrosa and structural elucidation of halipeptin D (5), a relative of the previously isolated halipeptins A-C (1-3), is described along with the total synthesis of a number of oxazoline analogues (7 a-d and epi-7 c-d). The developed synthetic strategy provides a flexible entry into the various isomers of the polyketide domain of the halipeptins and improvises
Total Synthesis of Halipeptins A and D and Analogues
作者:K. C. Nicolaou、David W. Kim、Daniel Schlawe、Dimitrios E. Lizos、Rita G. de Noronha、Deborah A. Longbottom
DOI:10.1002/anie.200500702
日期:2005.8.5
Enantioselective synthesis of (S)- and (R)-α-methylserines: application to the synthesis of (S)- and (R)-N-Boc-N,O-isopropylidene-α-methylserinals
作者:Alberto Avenoza、Carlos Cativiela、Francisco Corzana、Jesús M. Peregrina、David Sucunza、Marı́a M. Zurbano
DOI:10.1016/s0957-4166(01)00159-8
日期:2001.4
This report describes the synthesis of enantiomerically pure (S)- and (R)-alpha -methylserines on a multigram scale, starting from the Weinreb amide of 2-methyl-2-propenoic acid and using a stereodivergent synthetic route that involves a Sharpless asymmetric dihydroxylation reaction. As a synthetic application of these quaternary alpha -amino acids, they were used as starting materials in the synthesis of the well-known valuable homochiral (S)- and (R)-N-Boc-N,O-isopropylidene-alpha -methylserinal building blocks. (C) 2001 Elsevier Science Ltd. All rights reserved.
Enantioselective Synthesis of α-Methyl-<scp>d</scp>-cysteine and Lanthionine Building Blocks via α-Methyl-<scp>d</scp>-serine-β-lactone
作者:Nicole D. Smith、Murray Goodman
DOI:10.1021/ol034025p
日期:2003.4.1
[GRAPHICS]We report here the enantioselective synthesis of Boc-alpha-methyl-D-cysteine(PMB)-OH and lanthionine building blocks through the regloselective ring opening of key intermediate Boc-alpha-methyl-D-serine-beta-lactone.