The present invention relates to new and improved methods of synthesizing radiolabelling agents which can be used to label biomolecules for use as radiopharmaceuticals. It further relates to certain novel radiolabelling agents and their use in such methods. PET imaging methods and methods of diagnosis employing such radiolabelling agents form a further aspect of the invention.
TEMPO-Catalyzed Oxidative Amidation of Alcohols via Hexafluoroisopropyl Esters
作者:Jean-Michel Vatèle
DOI:10.1055/s-0034-1381056
日期:——
Stepwise oxidative amidation of alcohols using trichloroisocyanuric acid, a catalytic amount of TEMPO in combination with pyridine and hexafluoroisopropyl (HFIP) alcohol followed by amines is described. This procedure used HFIP esters as activating esters which were found to be very efficient acylating agents for amide bond formation. This process is compatible with a number of functional groups and acid-sensitive protecting groups.
Oxidative Esterification of Aldehydes Using a Recyclable Oxoammonium Salt
作者:Christopher B. Kelly、Michael A. Mercadante、Rebecca J. Wiles、Nicholas E. Leadbeater
DOI:10.1021/ol400785d
日期:2013.5.3
aldehydes to hexafluoroisopropyl (HFIP) esters using the oxoammoniumsalt 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate (1a) is reported. These esters can be readily transformed into a variety of other functional groups. The spent oxidant (1b) can be recovered and conveniently reoxidized to regenerate the oxoammoniumsalt, 1a.
Many abundant and highly bioactive naturalalkaloids contain an indolizidine skeleton. A simple, high yielding method to synthesize this scaffold from N-heterocycles was developed. A wide range of pyridines, quinolines and isoquinolines reacted with Donor-Acceptor (DA)-aminocyclopropanes via an ytterbium(III) catalyzed [3+2] annulation reaction to give tetrahydroindolizine derivatives. The products