Synthesis of Substituted 1‐Alkylidenephthalanes via Lithium‐Promoted 5‐exo‐dig Cyclization
Synthesis of Substituted 1‐Alkylidenephthalanes via Lithium‐Promoted 5‐exo‐dig Cyclization
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通过锂促进的 5âexoâdig 环化合成取代的 1â 亚烷基酞烷
DOI:
10.1002/ejoc.201800205
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发表时间:
2018
影响因子:
2.8
通讯作者:
Wünsch B
中科院分区:
文献类型:
--
作者:
Bunse P;Würthwein EU;Wünsch B
A one‐pot synthesis of 1‐alkylidenephthalanes from 3‐(2‐bromophenyl)propyne derivatives has been developed. 3‐(2‐Bromophenyl)propynal acetals9and corresponding orthoester19were treated successively withn‐butyllithium and various aldehydes and ketones at low temperature to obtain 1‐alkylidenephthalanes10and20with various functional groups at the exocyclic methylene moiety. Halogen‐metal exchange, nucleophilic addition to various carbonyl compounds, regioselective 5‐exo‐dig cyclization of the respective intermediate lithium alcoholate and hydrolysis represent the key steps in this Domino reaction. A two‐step mechanism involving at first a synchronous cyclization to form a vinyllithium intermediate and then a methoxide elimination leading to the respective 1‐methoxy allenes is suggested based on DFT‐calculations.
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DOI:
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发表时间:
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期刊:
影响因子:
--
作者:
A. Baeyer
通讯作者:
A. Baeyer
影响因子:
3.6
作者:
Patil, NT;Pahadi, NK;Yamamoto, Y
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Yamamoto, Y
影响因子:
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作者:
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通讯作者:
Roses,JB
DOI:
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发表时间:
1980
期刊:
影响因子:
--
作者:
K. Murata;A. Matsuda
通讯作者:
A. Matsuda
DOI:
--
发表时间:
1952
期刊:
影响因子:
--
作者:
G. Eglinton;E. Jones;M. Whiting
通讯作者:
M. Whiting