作者:Stephen Caddick、Sakthitharan Shanmugathasan、Denis Brasseur、Vern M Delisser
DOI:10.1016/s0040-4039(97)01259-8
日期:1997.8
The presence of the p-methoxyphenyl protecting group enables the asymmetric dihydroxylation of homoallylic enynols to be carried out in good yield and with high levels of enantioselectivity.
对甲氧基苯基保护基的存在使得均烯丙基烯醇的不对称二羟基化能够以高收率和高对映选择性进行。
Total Synthesis and Absolute Stereochemistry of Plakortone D
作者:Patricia Y. Hayes、William Kitching
DOI:10.1021/ja026728s
日期:2002.8.1
The first total synthesis of plakortone D is described and thereby establishes the structure and absolutestereochemistry of the most biologically active member of the marine-derived plakortone family. The sterically congested bicyclic lactone core results from a Pd(II)-induced hydroxycyclization−carbonylation−lactonization sequence on an enediol whose chirality was installed by AD-technology. Attachment
描述了 plakortone D 的第一次全合成,从而建立了海洋衍生的 plakortone 家族中最具生物活性成员的结构和绝对立体化学。空间拥挤的双环内酯核心是由 Pd(II) 诱导的羟基环化 - 羰基化 - 内酯化序列在烯二醇上产生的,其手性是通过 AD 技术安装的。侧链的连接也是使用 AD 方法构建的,是通过使用改进的 Julia 耦合实现的。所描述的方法能够以正确的(天然)立体化学系列获得其他 plakortones 和类似物。
Gold-catalyzed reactions of conjugated haloacetylenes are well known and usually result in the formation of addition or dimerizationproducts. Herein, we report a gold-catalyzed reaction of non-conjugated haloacetylenes, which leads exclusively to the halogenated cyclization products. Remarkable is the gold-catalyzed reaction of tritylhaloacetylenes to haloindene derivatives, as mechanistic studies reveal
Synthesis of the Sponge-Derived Plakortone Series of Bioactive Compounds
作者:Patricia Y. Hayes、Sharon Chow、Fredrik Rahm、Paul V. Bernhardt、James J. De Voss、William Kitching
DOI:10.1021/jo101224w
日期:2010.10.1
liberated primary alcohol 79 was converted by standard procedures to key enediol 89 which, with the Pd(II) protocol, afforded the major separable plakortones 90 and 91, with the former being identical with natural plakortone C (3). Very mild hydrogenation of 90 afforded a saturated plakortone, identical with natural plakortone F (6), thus establishing its structure and absolutestereochemistry. Available
Iron(III)-Catalyzed Carboannulations of Homopropargylic Alcohols: A One-Pot General Synthesis of 4-(2,2-Diarylvinyl)quinolines and 4-(2,2-Diarylvinyl)-2<i>H</i>-chromenes
作者:Sukanya De、Chinmay Chowdhury
DOI:10.1021/acs.joc.3c00442
日期:2023.6.2
A simple and efficient approach for the general synthesis of 4-(2,2-diarylvinyl)quinolines 5 and 4-(2,2-diarylvinyl)-2H-chromenes 6 has been developed using Fe(III)-catalyzed intramolecular annulations of homopropargyl substrates 1 and 2, respectively. The high yields (up to 98%) achieved using simple substrates, an environmentally benign low-cost catalyst, and less hazardous reaction conditions make