Bryostatins: The Asymmetric Synthesis of the C<sub>1</sub>-C<sub>9</sub>and C<sub>17</sub>-C<sub>27</sub>Fragments
作者:Jef De Brabander、Maurits Vandewalle
DOI:10.1055/s-1994-25589
日期:——
The construction of the fragments C1-C9 3 and C17-C27, 4a of the bryostatins in a enantioselective and highly diastereoselective fashion is described. The usefulness of the "chiron" approach is illustrated with the synthesis of these fragments from, respectively, D-pantolactone (6) and D-isobutyl lactate (23) as chiral templates.
Total Synthesis of Bryostatin 7 <i>via</i> C–C Bond-Forming Hydrogenation
作者:Yu Lu、Sang Kook Woo、Michael J. Krische
DOI:10.1021/ja205673e
日期:2011.9.7
The marine macrolide bryostatin7 is prepared in 20 steps (longest linear sequence) and 36 total steps with five C-C bonds formed using hydrogenative methods. This approach represents the most concise synthesis of any bryostatin reported, to date.
海洋大环内酯苔藓抑素 7 分 20 个步骤(最长线性序列)和 36 个总步骤制备,使用氢化方法形成五个 CC 键。这种方法代表了迄今为止报道的任何苔藓抑素的最简洁的合成。
Synthetic Studies on the Nhatrangins: Stereoselective Access to an Advanced Aldehyde Intermediate
作者:Ludovic Raffier、Olivier Piva
DOI:10.1002/ejoc.201201338
日期:2013.2
strategies have been considered to achieve the first total synthesis of nhatrangins A and B. The first approach based on a cross metathesis (CM) reaction was unsuccessful. The second, which combined a highly stereoselective alkylation, a diastereoselective aldolization, and finally an esterification, furnished an advancedaldehydeintermediate bearing the three contiguous stereogenic centres and the expected
已经考虑了两种不同的策略来实现首次全合成 nhatrangins A 和 B。基于交叉复分解 (CM) 反应的第一种方法是不成功的。第二个结合了高度立体选择性烷基化、非对映选择性醛醇化和最后的酯化,提供了带有三个连续立体中心和预期侧链的高级醛中间体。
Syntheses of C17–C27 fragments of 20-deoxybryostatins for assembly using Julia and metathesis reactions
作者:Matthew Ball、Thomas Gregson、Hiroki Omori、Eric J. Thomas
DOI:10.1039/c7ob00076f
日期:——
several steps to introduce alkynyl ester functionality, the stereoselective addition of a tributyltin cuprate followed by tributyltin–bromine exchange gave the required vinylic bromides. The palladium(0) catalysed couplings worked very well for enol esters containing thioether substituents and gave products with retention of the position and geometry of the trisubstituted double bond derived from the vinylic
Synthesis of the C(17)–C(27) fragment of the 20-deoxybryostatins
作者:Pedro Almendros、Alastair Rae、Eric J. Thomas
DOI:10.1016/s0040-4039(00)01697-x
日期:2000.12
A synthesis of the C(17)–C(27) fragment of the 20-deoxybryostatins is described in which the key step is a palladium(0) catalysed coupling of a tributyltin enolate with a vinylic bromide.