Stereoselective Synthesis of Cyclic Guanidines by Directed Diamination of Unactivated Alkenes
作者:Artur K. Mailyan、Kyle Young、Joanna L. Chen、Bradley T. Reid、Armen Zakarian
DOI:10.1021/acs.orglett.6b02778
日期:2016.11.4
method for a directed stereoselective guanidinylation of alkenes is described. The guanidine unit can be delivered as an intact fragment by a hydroxy or carboxy group, usually with a high level of stereocontrol. After the guanidine delivery, the directinggroup can be cleaved under exceptionally mild conditions, typically by alcoholysis in the presence of acetic acid. Broad functionalgroup tolerance
Gold- or Platinum-Catalyzed Cascade Processes of Alkynol Derivatives Involving Hydroalkoxylation Reactions Followed by Prins-Type Cyclizations
作者:José Barluenga、Amadeo Fernández、Alejandro Diéguez、Félix Rodríguez、Francisco J. Fañanás
DOI:10.1002/chem.200900856
日期:2009.11.2
efficient method for the synthesis of [3.3.1]bicyclic compounds from easily available alkynol derivatives has been developed. The reaction is based on a gold‐ or platinum‐catalyzed tandem process that involves an intramolecular hydroalkoxylation of a triple bond followed by a Prins‐type cyclization. The reaction has been carried out with differently substituted alkynol derivatives and oxygen‐, nitrogen‐
Indium Triiodide Catalyzed Direct Hydroallylation of Esters
作者:Yoshihiro Nishimoto、Yoshihiro Inamoto、Takahiro Saito、Makoto Yasuda、Akio Baba
DOI:10.1002/ejoc.201000475
日期:——
InI 3 -catalyzed hydroallylation of esters by using hydro-and allysilanes under mild conditions has been accomplished. Many significant groups such as alkenyl, alkynyl, cyano, and nitro ones survive under these conditions. This reaction system provided routes to both homoallylic alcohols and ethers, in which either elimination of the alkoxy moiety or of the carbonyl oxygen atom could be freely selected
通过在温和条件下使用氢化硅烷和烯丙基硅烷完成了 InI 3 催化的酯的氢化烯丙基化。许多重要的基团,如链烯基、炔基、氰基和硝基基团在这些条件下仍然存在。该反应体系为高烯丙醇和醚提供了途径,其中烷氧基部分或羰基氧原子的消除可以通过改变烷氧基部分和氢硅烷上的取代基自由选择。此外,内酯的氢烯丙基化发生在不开环的情况下,以高产率生产所需的环醚。
A New Mode of Cyclization of Enynes: Synthesis of Cycloalkyl Ketones through a Platinum-Catalyzed Hydrative Cycloisomerization Reaction
作者:Pilar Pardo、Amadeo Fernández、Francisco J. Fañanás、Félix Rodríguez
DOI:10.1002/adsc.201200312
日期:2012.8.13
A new platinum-catalyzed cascade reaction that proceeds through an unusual cyclization pathway of enyne derivatives is described. This operationally simple, air- and moisture-tolerant reaction affords cycloalkyl ketone derivatives in a straightforward manner. The reaction can be considered as an unprecedented abnormal platinum-catalyzedcyclization of enynes. The role of the platinum catalyst promoting