Overcoming Kinetic and Thermodynamic Challenges of Classic Cope Rearrangements.

Overcoming Kinetic and Thermodynamic Challenges of Classic Cope Rearrangements.
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DOI:
10.1021/acs.joc.0c02690
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发表时间:
2021-02-05
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Grenning AJ
Grenning AJ
中科院分区:
其他
文献类型:
--
作者:
Fereyduni E;Lahtigui O;Sanders JN;Tomiczek BM;Mannchen MD;Yu RA;Houk KN;Grenning AJ

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Systematic evaluation of 1,5-dienes bearing 3,3-electron-withdrawing groups and 4-methylation results in the discovery of a Cope rearrangement for Meldrum’s acid-containing substrates that have unexpectedly favorable kinetic and thermodynamic profiles. The protocol is quite general due to a concise and convergent synthesis from abundant starting materials. Furthermore, products with an embedded Meldrum’s acid moiety are prepared, which, in turn, can yield complex amides under neutral conditions. We have now expanded the scope of the reductive Cope rearrangement, which, via chemoselective reduction, can promote thermodynamically unfavorable [3,3] sigmatropic rearrangements of 3,3-dicyano-1,5-dienes to form reduced Cope rearrangement products. The Cope rearrangement is found to be stereospecific and can yield enantioenriched building blocks when chiral, nonracemic 1,3-disubstituted allylic electrophiles are utilized. We expand further the use of Cope rearrangements for the synthesis of highly valuable building blocks for complex- and drug-like molecular synthesis.
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