Copper-catalyzed radical cascade cyclization for the synthesis of phosphorated indolines
作者:Hong-Yu Zhang、Liu-Liang Mao、Bin Yang、Shang-Dong Yang
DOI:10.1039/c4cc10267c
日期:——
A novel and convenient approach to the synthesis of various phosphorated indolinesviaa copper-catalyzed radical cascade cyclization reaction has been developed.
A practical and stereoselective synthesis of the tubuvaline-tubuphenylalanine (Tuv-Tup) fragment of tubulysin is achieved involving the opening of aziridine, crucial MacMillan α-hydroxylation on both fragments, and an epoxide-opening reaction.
Direct Synthesis of 2-Formylpyrrolidines, 2-Pyrrolidinones and 2-Dihydrofuranones via Aerobic Copper-Catalyzed Aminooxygenation and Dioxygenation of 4-Pentenylsulfonamides and 4-Pentenylalcohols
作者:Tomasz Wdowik、Sherry R. Chemler
DOI:10.1021/jacs.7b05680
日期:2017.7.19
and a 2-ketopyrrolidine has been developed. This transformation occurs via aerobic copper-catalyzed alkene aminooxygenation where molecular oxygen serves as both oxidant and oxygen source. The 2-formylpyrrolidines can further undergo oxidative carbon-carbon bond cleavage in situ upon addition of DABCO, providing 2-pyrrolidinones. These transformations have been demonstrated for a range of 4-pentenylsulfonamides
Oxidative Intramolecular Bromo-Amination of <i>N</i>-Alkenyl Sulfonamides via Umpolung of Alkali Metal Bromides
作者:Katsuhiko Moriyama、Yuta Izumisawa、Hideo Togo
DOI:10.1021/jo201113r
日期:2011.9.2
The oxidative intramolecular bromo-amination of various N-alkenyl sulfonamides and N-alkenoxyl sulfonamides via umpolung of alkali metal bromides occurred exo-selectively to generate cyclic bromoamides in high yields with good diastereoselectivities. This method provided the desired products without elaborating the stoichiometric amount of corresponding organic waste.
Brønsted Acid-assisted Intramolecular Aminohydroxylation of <i>N</i>-Alkenylsulfonamides under Heavy Metal-free Conditions
作者:Katsuhiko Moriyama、Yuta Izumisawa、Hideo Togo
DOI:10.1021/jo301523a
日期:2012.11.2
The intramolecular aminohydroxylation of N-alkenylsulfonamides proceeded under heavy metal-free conditions to give substituted prolinol derivatives in high yields. Oxone activated by catalytic Bronsted acid worked well as an electrophilic oxidant for this reaction.