Pd(II)-catalyzed intramolecularaminocarbonylation of olefins bearing many types of nitrogen nucleophiles has been examined under two typical conditions: acidic conditions [conditions A, typically PdCl(2) (0.1 equiv) and CuCl(2) (3.0 equiv) under 1 atm of CO at room temperature in methanol] and buffered conditions [conditions B, typically PdCl(2) (0.1 equiv) and CuCl(2) (2.3 equiv) under 1 atm of CO at
A Palladium-Catalyzed Aminoalkynylation Strategy towards Bicyclic Heterocycles: Synthesis of (±)-Trachelanthamidine
作者:Stefano Nicolai、Cyril Piemontesi、Jérôme Waser
DOI:10.1002/anie.201100718
日期:2011.5.9
Sweet cyclizations: The synthesis of pyrrolizidines and indolizidines has been achieved. Olefins were subjected to an intramolecular palladium‐catalyzed aminoalkynylation with the hypervalent iodine reagent TIPS‐EBX. After removal of the protecting group, a two‐step cyclization sequence and subsequent reduction led to the natural product (±)‐trachelanthamidine (see scheme; TIPS‐EBX=triisopropylsilyl
A Facile Highly Regio- and Stereoselective Preparation of <i>N</i>-Tosyl Allylic Amines from Allylic Alcohols and Tosyl Isocyanate via Palladium(II)-Catalyzed Aminopalladation−β-Heteroatom Elimination
作者:Aiwen Lei、Xiyan Lu
DOI:10.1021/ol006130u
日期:2000.7.1
The high regio- and stereoselectivity have been obtained from the allylic substitution reaction catalyzed by palladium(II) species. From allylic alcohols, one-pot reaction with tosyl isocyanate followed by palladium(II)-catalyzed allylic substitution gives N-tosyl (E)-allylic amines in high yield. The substitution occurs only at the gamma-position of the 1- or 3-substituted allylic alcohols.
Iodoamination of Alkenyl Sulfonamides by Potassium Iodide and Hydrogen Peroxide in Aqueous Medium
作者:Sabrina Giofrè、Roberto Sala、Egle Maria Beccalli、Leonardo Lo Presti、Gianluigi Broggini
DOI:10.1002/hlca.201900088
日期:2019.7
A procedure for the iodoamination of unfunctionalized olefins tethered to a tosyl‐protected NH‐group has been developed. The combined use of KI and H2O2 in aqueous medium was effective for the preparation of iodomethyl‐substituted nitrogen‐containing heterocycles. The selective exo‐trig iodocyclization provided 1,2‐bifunctional 5‐, 6‐, and 7‐membered cyclic skeletons.
已经开发了一种方法,用于将未官能化的烯烃束缚在甲苯磺酰基保护的NH-基团上进行碘化。在水性介质中联合使用KI和H 2 O 2可以有效地制备碘甲基取代的含氮杂环。选择性的exo-trig碘环化提供了1,2-双功能的5、6和7元环状骨架。
Carbamate mediated functionalization of unsaturated alcohols II. Regio- and stereo-selective synthesis of 1,3-syn and 1,2-anti amino alcohol derivatives via iodocarbamation
A regio- and stereo-selective introduction of nitrogen functions to double bonds of acyclic, allylic and homoallylic alcohols was achieved via iodocyclization of the corresponding N-sulfonylated O-carbamates.