Aromatic organozinc reagents as nucleophiles in the α-arylation of piperidine and tetrahydropyran
摘要:
The arylation at the alpha-position of piperidine derivatives is achieved in good yield using aromatic organozinc reagents and either 2-methoxylated or alpha-cyanated piperidine. Oxygen-containing heterocycles such as 2-methoxy-tetrahydropyrall reacts in a same manner to yield efficiently 2-arylated tetrahydropyran. (c) 2005 Elsevier Ltd. All rights reserved.
Photoredox Radical/Polar Crossover Enables Construction of Saturated Nitrogen Heterocycles
作者:Loïc R. E. Pantaine、John A. Milligan、Jennifer K. Matsui、Christopher B. Kelly、Gary A. Molander
DOI:10.1021/acs.orglett.9b00602
日期:2019.4.5
Photoredox-mediated radical/polar crossover (RPC) processes offer new avenues for the synthesis of cyclic molecules. This process has been realized for the construction of medium-sized saturated nitrogen heterocycles. Photocatalytically generated alkylradicals possessing pendant leaving groups engage imines in C–C bond formation, and subsequent reduction of the intermediate nitrogen-centered radical triggers