Transition Metal Free C–N Bond Forming Dearomatizations and Aryl C–H Aminations by in Situ Release of a Hydroxylamine-Based Aminating Agent
摘要:
We outline a simple protocol that accesses directly unprotected secondary amines by intramolecular C-N bond forming dearomatization or aryl C-H amination. The method is dependent on the generation of a potent electrophilic aminating agent released by in situ deprotection of O-Ts activated N-Boc hydroxylamines.
acetalization method of ketones and aldehydes under non‐acidic conditions was developed using diazophenanthrenequinone and PdBr2. The formed acetals that have a phenanthrene skeleton withstand under mild acidic conditions. Removal of acetals was successfully proceeded under strong acidic or oxidation conditions using aqueouscericammoniumnitrate (CAN).
Stereoinversion of Unactivated Alcohols by Tethered Sulfonamides
作者:Paul T. Marcyk、Latisha R. Jefferies、Deyaa I. AbuSalim、Maren Pink、Mu‐Hyun Baik、Silas P. Cook
DOI:10.1002/anie.201812894
日期:2019.2.4
remains an undeveloped area of organic synthesis. Moreover, catalytic activation of this difficult electrophile with predictable stereo-outcomes presents an even more formidable challenge. Described herein is a simple iron-based catalyst system which provides the mild, direct conversion of secondary and tertiary alcohols to sulfonamides. Starting fromenantioenriched alcohols, the intramolecular variant
Alcohol, Aldehyde, and Ketone Liberation and Intracellular Cargo Release through Peroxide-Mediated α-Boryl Ether Fragmentation
作者:Ramsey D. Hanna、Yuta Naro、Alexander Deiters、Paul E. Floreancig
DOI:10.1021/jacs.6b07890
日期:2016.10.12
α-Boryl ethers, carbonates, and acetals, readily prepared from the corresponding alcohols that are accessedthrough ketone diboration, react rapidly with hydrogen peroxide to release alcohols, aldehydes, and ketones through the collapse of hemiacetal intermediates. Experiments with α-boryl acetals containing a latent fluorophore clearly demonstrate that cargo can be released inside cells in the presence
[EN] COMPOUNDS CAPABLE OF RELEASING FRAGRANT COMPOUNDS<br/>[FR] COMPOSÉS CAPABLES DE LIBÉRER DES COMPOSÉS ODORIFÉRANTS
申请人:GIVAUDAN SA
公开号:WO2012085287A1
公开(公告)日:2012-06-28
Provided is class of compounds of formula (I) wherein X, R1, R2 and R3 have the same meaning as given in the specification capable of releasing fragrant compounds in a controlled manner into the surroundings.
Evidence for Atropisomerism in Polycyclic γ‐Butenolides: Synthesis, Scope, and Spectroscopic Studies
作者:Debayan Roy、Beeraiah Baire
DOI:10.1002/chem.202005174
日期:2021.2.24
Design and development of a domino cyclative approach for the synthesis of new polycyclic γ‐butenolides from β‐aryl‐Z‐enoate propargylic alcohols, through the interception of an intermediate of the Z‐enoate‐assisted Meyer–Schuster rearrangement, has been reported. A systematic NMR analysis of various derivatives of this class revealed and supported the potential atropisomerism associated with them