Base-promoted cyclocondensation of ortho-disubstituted benzonitrile oxides with active methylene compounds provides a concise route to highlyfunctionalizedisoxazole derivatives.
Total Synthesis and Structure Assignment of the Anthrone C-Glycoside Cassialoin
作者:Yasuhito Koyama、Ryo Yamaguchi、Keisuke Suzuki
DOI:10.1002/anie.200704625
日期:2008.1.25
Molecular Sieve (MS 4A) Promoted Cyclocondensation of Hindered, Aromatic Nitrile Oxides and Cyclic Diketones under Mild Conditions
作者:Keisuke Suzuki、Tomoo Matsuura、Jeffrey W. Bode、Yoshifumi Hachisu
DOI:10.1055/s-2003-41436
日期:——
Molecular sieves (MS 4A) serve as efficient promoters for the cyclocondensation of stable, hindered nitrile oxides and a variety of cyclic diketones to afford fused isoxazoles in good yield. The operational simplicity and remarkably mild reaction conditions compliment our amine-promoted cyclocondensation conditions and demonstrate broad substrate scope.
Amine-promoted cyclocondensation of highly substituted aromatic nitrile oxides with diketones
作者:Jeffrey W Bode、Yoshifumi Hachisu、Tomoo Matsuura、Keisuke Suzuki
DOI:10.1016/s0040-4039(03)00614-2
日期:2003.4
Base-promoted cyclocondensation of hindered nitrileoxides and cyclic diketones affords highly functionalized, sterically-encumbered isoxazole products in good yield. The mild reaction conditions (NEt3, EtOH) are tolerant to a wide variety of functionality and permit the preparation of precursors to complex polycycles typically inaccessible via direct, intermolecular carboncarbon bond forming reactions