Iron-Catalyzed Redox Radical Cyclizations of 1,6-Dienes and Enynes
摘要:
Treatment of 1,6-dienes and enynes with FeCl3 or Fe(Pc) in the presence of NaBH4 and air or O-2 causes radical cyclization to give five-membered carbo or heterocyclic compounds, Into which a halogen atom or hydroxyl group was introduced.
Iron-Catalyzed Redox Radical Cyclizations of 1,6-Dienes and Enynes
摘要:
Treatment of 1,6-dienes and enynes with FeCl3 or Fe(Pc) in the presence of NaBH4 and air or O-2 causes radical cyclization to give five-membered carbo or heterocyclic compounds, Into which a halogen atom or hydroxyl group was introduced.
<i>Anti</i> Carbocyanative Cyclization of Enynes under Nickel Catalysis
作者:Tomohiro Igarashi、Shigeru Arai、Atsushi Nishida
DOI:10.1021/jo400342y
日期:2013.5.3
Anti carbocyanative cyclization using 1,6-enynes under nickel catalysis is described. This reaction is triggered by hydronickelation to alkenes followed by carbometalation. Steric repulsion caused by the bulky substituents on alkynes promotes isomerization of the carbon–carbon double bond geometry in an organonickel intermediate to introduce both alkyl and cyano groups in an anti fashion.