The first formal intramolecular 1,3-insertion into OSi bond of rhodium(II) azavinyl carbene have been developed, and valuable phthalan derivatives could be synthesized efficiently. In addition, various functional groups could be introduced to the product conveniently in the assistant of TBAF.
已经开发了第一个正式的分子内 1,3-插入到铑 (II) 氮杂乙烯基卡宾的O Si 键中,并且可以有效地合成有价值的酞烷衍生物。此外,在TBAF的辅助下,可以方便地将各种官能团引入到产品中。
Rapid Access to Oxabicyclo[2.2.2]octane Skeleton through Cu(I)‐Catalyzed Generation and Trapping of Vinyl‐
<i>o</i>
‐quinodimethanes (
<scp>
Vinyl‐
<i>o</i>
‐QDMs
</scp>
)
<sup>†</sup>
作者:Hejiang Luo、Chuan He、Huanfeng Jiang、Shifa Zhu
DOI:10.1002/cjoc.202000144
日期:2020.10
A Cu(I)‐catalyzed three‐component reaction of terminal enynals/enynones, diazo compounds, and alkenes has been developed. With this method, a series of oxabicyclo[2.2.2]octanes were effectively synthesized in high yields under mild reaction conditions. This transformation is proposed to proceed through trapping of the cyclic vinyl‐o‐quinodimethanes (vinyl‐o‐QDMs) species, which were generated from
Enynes connected through aromatic rings are used as substrates for metathesis reactions. The reactivity of three ruthenium carbene complexes is compared. The resulting 1,3-dienes are suitable precursors of polycyclic structures via a Diels−Alder process. Some domino RCM-Diels−Alder reactions are performed, suggesting a possible beneficial effect of the ruthenium catalyst in the cycloaddition process
Enynes, easily obtained by the Sonogashira coupling reactions of aromatic iodides. undergo. with good yields, en ne metathesis using the Grubbs catalyst. The resulting dienes are interesting carbo- and heterocycles which can give complex natural frameworks by Diels Alder reactions. Thus. an estradiol type skeleton is obtained in two steps from the corresponding enynes. An example of a metathesis-Diels-Alder cascade one-pot process is reported. (C) 2001 Elsevier Science Ltd. All rights reserved.