New Applications of 1,5-Hydrogen Atom Transfer Reactions: Self-Oxidizing Protecting Groups
作者:Dennis P. Curran、Hosung Yu
DOI:10.1055/s-1992-34173
日期:——
Three new alcohol protecting groups are introduced: o-bromobenzyl, o-bromo(methylenedioxy)benzyl, and o-bromotrityl. Removal of these protecting groups under reductive conditions with tributyltin hydride is coupled with an oxidation of the substrate to produce directly an aldehyde or ketone. This oxidation occurs by 1,5-hydrogen transfer, followed by ß-fragmentation. For example, treatment of the o-bromobenzyl ether of 3-phenyl-1-propanol with tibutyltin hydride at 0.001 M (80°C) directly produces 3-phenyl-1-propanal. An application to the selective oxidation of primary alcohols in the presence of secondary alcohols is also introduced.
Au-Catalyzed Biaryl Coupling To Generate 5- to 9-Membered Rings: Turnover-Limiting Reductive Elimination versus π-Complexation
作者:Tom J. A. Corrie、Liam T. Ball、Christopher A. Russell、Guy C. Lloyd-Jones
DOI:10.1021/jacs.6b10018
日期:2017.1.11
The intramolecular gold-catalyzed arylation of arenes by aryl-trimethylsilanes has been investigated from both mechanistic and preparative aspects. The reaction generates 5- to 9-membered rings, and of the 44 examples studied, 10 include a heteroatom (N, O). Tethering of the arene to the arylsilane provides not only a tool to probe the impact of the conformational flexibility of Ar-Au-Ar intermediates
Stable Oxypyridinium Triflate (OPT) Salts for the Synthesis of Halobenzyl Ethers
作者:Philip A. Albiniak、Shawn M. Amisial、Gregory B. Dudley、Joseph P. Hernandez、Sarah E. House、Margaret E. Matthews、Ernest O. Nwoye、Maureen K. Reilly、Sami F. Tlais
DOI:10.1080/00397910701818362
日期:2008.2.13
A collection of new oxypyridinium triflate reagents (1a-d) for the synthesis of halobenzyl ethers from alcohols under "mix-and-heat" conditions is described. The reagents are stable organic salts that can be stored indefinitely and handled without special precautions, making them attractive for general use in organic synthesis. Halobenzylation of representative alcohols occurs in good to excellent yield.
10.1021/jacv6b10018
作者:Corrie, Tom J. A.、Ball, Liam T.、Russell, Christopher A.、Lloyd-Jones, Guy C.