Facile 5-endo electrophilic cyclization of unsaturated amides with tBuOCl/I2
摘要:
5-Endo iodocyclization of various beta,gamma-unsaturated amides proceeded smoothly to give the corresponding conjugated imino-lactones exclusively in satisfactory yields with the use of (BuOCl)-Bu-1 and I-2 as the reagents, which proved to be much advantageous over the conventional I-2/NaHCO3. (c) 2006 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Aminocarbonylation of Allylic Alcohols
作者:Haoquan Li、Helfried Neumann、Matthias Beller
DOI:10.1002/chem.201601260
日期:2016.7.11
A benign and efficient palladium‐catalyzed aminocarbonylation reaction of allylic alcohols is presented. The generality of this novel process is demonstrated by the synthesis of β,γ‐unsaturated amides including aliphatic, cinnamyl, and terpene derivatives. The choice of ligand is crucial for optimal carbonylation processes: Whereas in most cases the combination of PdCl2 with Xantphos (L6) gave best
作者:Sean M. Smith、Nathan C. Thacker、James M. Takacs
DOI:10.1021/ja710492q
日期:2008.3.1
(>95%) and enantioselective (93-99% ee) rhodium-catalyzedhydroboration with pinacolborane (PinBH) using simple chiral monophosphite or phosphoramidite ligands in combination with Rh(nbd)2BF4. The most effective ligands identified are phosphoramidite 4, derived from BINOL and N-methylaniline, and phosphite 5c, prepared from the (4'-tert-butyl)phenyl TADDOL analogue and phenol. For example, (E)-3-hexenoic
Carbonylation reactions constitute important methodologies for the synthesis of all kinds of carboxylic acid derivatives. The development of novel and efficient catalysts for these transformations is of interest for both academic and industrial research. Here, the first palladium-based catalyst system for the aminocarbonylation of 1,3-dienes is described. This atom-efficient transformation proceeds
Nickel-Catalyzed Regio- and Enantioselective Hydrofluorination in Unactivated Alkenes
作者:Sungwoo Hong、Minseok Kim、Seunghoon Han
DOI:10.1055/a-2334-6568
日期:2025.1
While enantioselective hydrofluorination methods for activated alkenes represent a notable advance, the resultant enantiomeric excesses remain largely moderate, indicating the necessity for enhancements in precision, efficiency, and scope. We have recently developed an innovative nickel hydride catalytic system that enables regio- and enantioselective C–F bond formation with unactivated alkenes. By