Biphasic hydroformylation of dec-1-ene and styrene, at commercially competitive rates, can be successfully performed in imidazoliumtriflate ionic liquids; the ionic liquid network forms ‘inclusion complexes’ with the phosphane ligands used to modify the rhodium catalyst.
A Highly Convergent Total Synthesis of Leustroducsin B
作者:Barry M. Trost、Berenger Biannic、Cheyenne S. Brindle、B. Michael O’Keefe、Thomas J. Hunter、Ming-Yu Ngai
DOI:10.1021/jacs.5b07438
日期:2015.9.16
large variety of biological activities and unique structural features. An efficient and highlyconvergent total synthesis of Leustroducsin B was achieved in 17 longest linear and 39 total steps by disconnecting the molecule into three fragments having similar levels of complexity. These pieces were connected via a highly efficient chelate-controlled addition of a vinyl zincate to an α-hydroxy ketone and
Leustroducsin B 具有多种生物活性和独特的结构特征。Leustroducsin B 的高效且高度收敛的全合成通过 17 个最长的线性步骤和 39 个总步骤实现,方法是将分子断开为具有相似复杂度水平的三个片段。这些片段通过高效螯合控制将乙烯基锌酸盐添加到 α-羟基酮和硅介导的交叉偶联来连接。中央和西部片段的立体化学通过锌-苯酚催化的羟醛反应和钯催化的不对称烯丙基烷基化以高产率和优异的催化进行设置。
Total synthesis and stereochemical assignment of rakicidin F
Total synthesis of rakicidin F was accomplished in 20 linear steps (0.68% overall yield), which enabled the configural determination of its six stereogenic centers as 2R, 15R, 16R, 17S, 19S, and 21S. The macrolactonization of the rakicidin linear precursor was investigated and the unsuccessful results might be attributed to the steric hindrance near C16-OH.
Approach toward the Total Synthesis of Orevactaene. 2. Convergent and Stereoselective Synthesis of the C18−C31 Domain of Orevactaene. Evidence for the Relative Configuration of the Side Chain
作者:Michael G. Organ、Yaroslav V. Bilokin、Svetoslav Bratovanov
DOI:10.1021/jo0201777
日期:2002.7.1
synthesis of four diastereomeric hydrophobic tails (C22-C29) of the molecule with two stereogenic centers at C23 and C25; (ii) the synthesis of three stereodefined trisubstituted olefins 37, 38, and 43 using palladium(0)-catalyzed hydrometalation and metallometalation; and (iii) the convergent assembly of the aforementioned sections by a 'one-pot' lithium/halogen exchange, boron/lithium exchange, borate ester