Diastereo‐ and Enantioselective Access to Stereotriads through a Flexible Coupling of Substituted Aldehydes and Alkenes
作者:Jing Li、Alexander Preinfalk、Nuno Maulide
DOI:10.1002/anie.201900801
日期:2019.4.23
A flexible redox-neutral coupling of aldehydes and alkenes enables rapid access to stereotriads starting from a single stereocenter with perfect levels of enantio- and diastereoselectivity under mild conditions. The versatility of the method is highlighted by the installation of heteroatoms along the tether, which enables a route to structurally diverse building blocks. The formal synthesis of (+)-neopeltolide
Synthesis of α,ω‐Bis‐Enones by the Double Addition of Alkenyl Grignard Reagents to Diacid Weinreb Amides
作者:Stefan Wiesler、Michael A. Bau、Thomas Niepel、Sara L. Younas、Hieu‐Trinh Luu、Jan Streuff
DOI:10.1002/ejoc.201901043
日期:2019.9.30
The synthesis of bis‐enones from alkenyl bromides and α,ω‐bis‐Weinreb amides via a double Grignard reaction is reported. The work contains reliable protocols for the double addition and the efficient generation of the required substituted alkenyl Grignard reagents from alkenyl bromide precursors.
preparation of NiCRA (NaH-t-AmONa-Ni(OAc)2) in the presence of 2,2′-bipyridine (bpy) leads to a new reagent (termed NiCRA-bpy) which is shown to be one of the most efficient Ni based reagents reported so far for the homocoupling of aryl and vinyl halides (including chlorides). The homo coupling of cis- and trans-β-bromostyrenes is shown to be stereospecific.
Apoptogenic and antiproliferative analogs of ceramide
申请人:Deigner, Hans-Peter
公开号:EP1580187A1
公开(公告)日:2005-09-28
Described are analogs of ceramide which have apoptogenic and antiproliferative properties as well as pharmaceutical compositions containing these analogs. Also described is the therapeutic use of the ceramide analogs, e.g. for inhibiting proliferation, preferably in cancer therapy, or increased angiogenesis or for modulating apoptosis.
Cobalt-catalyzed aminocarbonylation of (hetero)aryl halides promoted by visible light
作者:Alexander M. Veatch、Erik J. Alexanian
DOI:10.1039/d0sc02178d
日期:——
aminocarbonylation of (hetero)arylhalides is widely applied in the synthesis of amides but relies heavily on the use of precious metal catalysis. Herein, we report an aminocarbonylation of (hetero)arylhalides using a simple cobalt catalyst under visible light irradiation. The reaction extends to the use of (hetero)aryl chlorides and is successful with a broad range of amine nucleophiles. Mechanistic investigations