Organocatalyzed Tsuji–Trost reaction: a new method for the closure of five- and six-membered rings
作者:Bojan Vulovic、Filip Bihelovic、Radomir Matovic、Radomir N. Saicic
DOI:10.1016/j.tet.2009.10.006
日期:2009.12
A combination of organotransition metal catalysis and organocatalysis allows for Tsuji–Trost 5-exo- and 6-exo-cyclizations of aldehydes. This transformation can also be accomplished as a catalytic asymmetric reaction, which affords vinylcyclopentane derivatives with up to 98%ee.
Studies on the SmI<sub>2</sub>-Promoted Pinacol-Type Cyclization: Synthesis of the Hexahydroazepine Ring of Balanol
作者:Ditte Riber、Rita Hazell、Troels Skrydstrup
DOI:10.1021/jo000538n
日期:2000.8.1
(cyclization and pinacol coupling) of the intermediate ketyl. This ring forming reaction has been applied to the construction of the fully functionalized hexahydroazepine ring of the PKC inhibitor, balanol. Initial attempts to develop an asymmetric version of this reaction indicate the use of chiral ligands based on the structure of HMPA.
Synthesis of <i>N</i>‐Aryl Isoxazolidines by Photo‐Promoted <i>N</i>‐Selective Arylation of Oximes and Cyclization Using Hypervalent Iodine Reagents and Copper Catalyst
corresponding N-aryl isoxazolidines in 26–95% yields. This method offers a faster reaction rate, lower catalyst loading and broader substrate scope of oxime than similar nitrone syntheses employing Chan-Lam-Evanscoupling. The reaction involves via a radical/single electron transfer (SET) pathway, and does not proceed in the absence of photoirradiation.