A systematic study of the diastereoselectivity of the radical carboazidation of methylenecyclohexane derivatives is presented. Several substitution patterns leading to a high level of stereocontrol have been identified. Axial attack is the preferred reaction pathway for cyclohexyl radicals, and excellent stereoselectivities can be obtained by introducing an axial substitutent at position 2. In this
Hydrogen Atom Transfer‐Mediated Cyclisations of Nitriles
作者:Oliver J. Turner、John A. Murphy、David J. Hirst、Eric P. A. Talbot
DOI:10.1002/chem.201805236
日期:2018.12.12
Hydrogenatomtransfer‐mediated intramolecular C−C coupling reactions between alkenes and nitriles, using PhSiH3 and catalytic Fe(acac)3, are described. This introduces a new strategic bond disconnection for ring‐closing reactions, forming ketones via imine intermediates. Of note is the scope of the reaction, including formation of sterically hindered ketones, spirocycles and fused cyclic systems.
General acid-mediated aminolactone formation using unactivated alkenes
作者:David Just、Carlos R. Gonçalves、Uroš Vezonik、Daniel Kaiser、Nuno Maulide
DOI:10.1039/d3sc04073a
日期:——
excellent functional group tolerance and chemoselectivity. The synthetic versatility of the products is demonstrated through a range of transformations, notably exploiting stereospecificrearrangement chemistry to produce sterically congested scaffolds.
Synthesis of Primary Amines via Hydrogen Atom Transfer-Initiated Cyclization/Reduction Cascade of Unsaturated Nitriles
作者:Henry Lindner、Michael Schneider、Philipp Mader、Frederic Su、Erick M. Carreira
DOI:10.1021/acs.orglett.4c01739
日期:2024.7.5
We report a hydrogen atom transfer-initiated cyclization/reduction cascade for the synthesis of primary amines from δ,ε- and ε,ζ-unsaturated nitriles. The HAT transformation employs Mn(acac)3 as a catalyst and utilizes air as an oxidant along with NaBH4 as a dual-purpose reductant toward the olefin and subsequently C═N. Aromatic and aliphaticnitriles incorporating mono-, di-, and trisubstituted olefins