Crafty aminals: The in situgeneration of hitherto unattainable alkynyl‐substituted N‐Boc‐protected imines was realized by the acid‐catalyzed elimination of tert‐butyl carbamate from N‐Boc aminals. A wide variety of N‐Boc imines can be generated, which can then be utilized for subsequent carbon–carbon bond‐forming reactions, such as Mannich‐type reactions.
Versatile In Situ Generated<i>N</i>-Boc-Imines: Application to Phase-Transfer-Catalyzed Asymmetric Mannich-Type Reactions
作者:Taichi Kano、Ryohei Kobayashi、Keiji Maruoka
DOI:10.1002/anie.201502215
日期:2015.7.13
enables the construction of various nitrogen‐containing molecules which cannot be accessed by the traditional approach. The utility of the novel imine precursor was demonstrated in the asymmetric Mannich‐type reaction under phase‐transfer conditions.
Acid-catalyzed efficient Friedel–Crafts reaction of indoles with N-Boc aminals
作者:Kaihe Zou、Jinxing Ye、Xin-Yan Wu
DOI:10.1016/j.tet.2015.08.030
日期:2015.10
An effective Friedel–Crafts reaction between N-Boc aminals and N-Boc indoles catalyzed by copper(II) trifluoromethanesulfonate has been developed. The lessaccessible N-Boc imines could be generated in situ from N-Boc aminals. The reaction was achieved in moderate to good yields under mild conditions.
[EN] IMPROVED N4 CHELATOR CONJUGATES<br/>[FR] CONJUGUES DE CHELATEUR N4 AMELIORES
申请人:GE HEALTHCARE LTD
公开号:WO2006008496A2
公开(公告)日:2006-01-26
The present invention provides tetra-amine chelator conjugates with biological targeting moieties, linked via a linker group and technetium complexes thereof as radiopharmaceuticals. The linker group is such that the chelator is mono-functionalised at the bridgehead position and provides both flexibility and a lack or aryl groups, to minimise lipophilicity and steric bulk. Protected versions of the chelators are provided, which permit conjugation with a wide range of targeting molecules without interfering reactions with the amine nitrogens of the tetra-amine chelator. Syntheses of the functionalised chelators are described, together with bifunctional chelate precursors. Radiopharmaceutical compositions comprising the technetium metal complexes of the invention are described, together with non-radioactive kits for the preparation of such radiopharmaceuticals.