Synthesis of 2-Alkoxy-5-methylenetetrahydropyrans: A Regioselective Ruthenium-Catalyzed C−C Coupling Reaction of Prop-2-yn-1-ols with Allyl Alcohol
作者:Sylvie Dérien、Loïc Ropartz、Jacques Le Paih、Pierre H. Dixneuf
DOI:10.1021/jo982300t
日期:1999.5.1
The carbon-carbon coupling of prop-2-yn-1-ols with allylalcohol is achieved in the presence of the ruthenium(II) catalyst RuCl(cod)(C(5)Me(5)). The coupling reaction is highly regioselective and leads to the HOCR(2)C(=CH(2))CH(2)CH(2)CHO isomer and, after cyclization, to either 2-hydroxy- or 2-alkoxy-5-methylenetetrahydropyrans, at room temperature or at 80 degrees C, respectively. It is used for
Synthesis and Biological Activity of Some Dibromoalkadienyl Ether Analogs of Juvenile Hormone
作者:Naoshi Nakagawa、Karl J. Kramer、Kenji Mori
DOI:10.1080/00021369.1981.10864895
日期:1981.10
Synthesis of (±)-mispyric acid, a triterpene inhibitor of DNA polymerase β isolated from Mischocarpus pyriformis
作者:Yusuke Imamura、Hirosato Takikawa、Kenji Mori
DOI:10.1016/s0040-4039(02)01193-0
日期:2002.8
The first synthesis of (+/-)-mispyric acid, an inhibitor of DNA polymerase beta with a novel triterpene skeleton, was achieved by starting from isoprene, geraniol and 1,5-dimethoxy-1,4-cyclohexadiene. (C) 2002 Elsevier Science Ltd. All rights reserved.
Postulated Biogenesis of WS9885B and Progress toward an Enantioselective Synthesis
作者:Christopher D. Vanderwal、David A. Vosburg、Sven Weiler、Erik J. Sorensen
DOI:10.1021/ol990723r
日期:1999.8.1
WS9885B promotes the assembly of microtubules in vitro and displays cytotoxicity as potent as paclitaxel against several cancer cell lines. In this Letter, we propose a biogenesis for this architecturally complex bacterial metabolite from a much simpler, polyunsaturated precursor. We also present significant progress toward a convergent, enantioselective synthesis of WS9885B, Our work features a chemoselective palladium-catalyzed cross coupling of two advanced building blocks and an uncommon Claisen-like cyclization.
Regioselective Cleavage of Electron‐Rich Double Bonds in Dienes to Carbonyl Compounds with [Fe(OTf)
<sub>2</sub>
(mix‐BPBP)] and a Combination of H
<sub>2</sub>
O
<sub>2</sub>
and NaIO
<sub>4</sub>
作者:Peter Spannring、Vital A. Yazerski、Jianming Chen、Matthias Otte、Bert M. Weckhuysen、Pieter C. A. Bruijnincx、Robertus J. M. Klein Gebbink
DOI:10.1002/ejic.201500213
日期:2015.7
cleavage methodologies. The combination of an Fe-based catalyst, [Fe(OTf)2(mix-BPBP)], and the oxidants H2O2 and NaIO4 can discriminate between electronically different doublebonds and oxidatively cleave the electron-rich bond in dienes to yield aldehydes and ketones in a regioselective manner. The reaction requires mild conditions (0-50 C) and short reaction times (70 min).