Enantioselective Coupling of Dienes and Phosphine Oxides
作者:Shao-Zhen Nie、Ryan T. Davison、Vy M. Dong
DOI:10.1021/jacs.8b11150
日期:2018.12.5
Pd-catalyzed intermolecular hydrophosphinylation of 1,3-dienes to afford chiral allylicphosphineoxides. Commodity dienes and air stable phosphineoxides couple to generate organophosphorus building blocks with high enantio- and regiocontrol. This method constitutes the first asymmetric hydrophosphinylation of dienes.
Palladium-Catalyzed Ring-Closing Reaction via C–N Bond Metathesis for Rapid Construction of Saturated <i>N</i>-Heterocycles
作者:Bangkui Yu、Suchen Zou、Hongchi Liu、Hanmin Huang
DOI:10.1021/jacs.0c10615
日期:2020.10.28
The ring-closingreactions based on chemical bond metathesis enable the efficient construction of a wide variety of cyclic systems which receive broad interest from medicinal and organic communities. However, the analogous reaction with C-N bond metathesis as a strategic fundamental step remains an unanswered challenge. Herein, we report the design of a new fundamental metallic C-N bond metathesis reaction
Radical-Mediated Heck-Type Alkylation: Stereoconvergent Synthesis of Functionalized Polyenes
作者:Hong Zhang、Xinxin Wu、Yunlong Wei、Chen Zhu
DOI:10.1021/acs.orglett.9b02838
日期:2019.9.20
The stereospecific synthesis of polyenes is of great synthetic value. Disclosed herein is a new, efficient, stereoconvergent approach for the synthesis of functionalized polyenes via a radical-mediated Heck-type alkylation. The easily accessed Z- and E-mixed alkenes are harnessed as starting material, leading to a unique stereoisomer of polyenes. In addition, the transformation features mild reaction
Photo-sensitized oxy-thiocyanation of terminal alkynes/1,3-aryldienes and their one-pot conversion to 2-hydroxy 4-substituted aryl thiazoles
作者:Kumaraswamy Gullapalli、Swargam Vijaykumar
DOI:10.1039/c9ob00054b
日期:——
regioselective visible light induced synthesis of aryl α-thiocyano ketones/thiocyano alcohols from activated terminal aryl alkynes and aryl 1,3-conjugated dienes was achieved. This mild and non-metallic oxidation is exclusively driven by benign ambient air in the presence of an organic photo-catalyst and NH4SCN. This protocol was also demonstrated at the 5 mmol scale for the synthesis of potentially therapeutic
Highly-functionalized pyrroles could be effectively synthesized from 3,6-dihydro-1,2-oxazines using a heterogeneous copper on carbon (Cu/C) under neat heating conditions. Furthermore, the in situ formation of 3,6-dihydro-1,2-oxazines via the hetero Diels–Alder reaction between nitroso dienophiles and 1,3-dienes and the following Cu/C-catalyzed pyrrolesynthesis also provided the corresponding pyrrole derivatives