A variety of oximes were synthesized from the corresponding alcohols, alkyl halides, or alkyl sulfonates without using external oxidants. With this simple two-step procedure involving substitution with readily available TsNHOTBS and subsequent treatment with CsF, a range of oximes were prepared including the ones hardly preparable with conventional procedures.
Indium mediated allylation of glyoxylate oxime ethers, esters and cyanoformates
作者:Dougal J. Ritson、Russell J. Cox、John Berge
DOI:10.1039/b402764g
日期:——
An indium mediated procedure has been developed for the allylation of activated O-functionalised oximes and nitriles as exemplified by a variety of glyoxylate derivatives. This method gives the corresponding free (or protected) amine in a one pot-process. The method is regiospecific and is carried out under remarkably mild conditions so that even oxime esters can be subjected to the typical reaction conditions.
Synthesis of Carbamoyl Fluorides via a Selective Fluorinative Beckmann Fragmentation
作者:Jin Woo Song、Hee Nam Lim
DOI:10.1021/acs.orglett.1c01721
日期:2021.7.16
useful carbamoyl fluorides. High selectivity for fragmentation over a potentially competing Beckmann rearrangement was observed. This protocol has a distinct mechanism and thus a different substrate scope compared with other synthetic methods. α-Oximinoamides derived from the readily available secondary amines, lactams, or isatins were converted into structurally diverse carbamoyl fluorides.
Metal-oxime chelates for use as radiopharmaceutical agents
申请人:Amersham International plc
公开号:US05993774A1
公开(公告)日:1999-11-30
Novel metal chelating compounds, and radiometal, e.g., technetium-99m complexes thereof. The compounds can be used to radiolabel small biologically active species with minimal effect on their biodistribution and activity. The compounds have formula (a) or (b): ##STR1## where Z is (CR.sub.2).sub.n or (CR).sub.n, n is 2 or 3, X is a ligand comprising S, N or O, each R is H or C1-C20 substituted or unsubstituted hydrocarbon group, provided that 1-3 CR.sub.2 groups represent a CO (amide) moiety, and provided that 1-3 R may each comprise a targeting group and/or a protein reactive functionality.
Biosynthesis inspired Diels–Alder route to pyridines: synthesis of the 2,3-dithiazolylpyridine core of the thiopeptide antibiotics
作者:Christopher J. Moody、Rachael A. Hughes、Stewart P. Thompson、Lilian Alcaraz
DOI:10.1039/b204868j
日期:——
Reaction of serine derived 1-alkoxy-2-azadienes with dehydroalanine derived dienophiles results in Diels-Alder reaction and aromatisation to give 2,3,6-trisubstituted pyridines, thereby establishing the viability of the proposed biosynthetic route to the pyridine ring of the thiopeptide antibiotics originally proposed by Bycroft and Gowland.