An Efficient Approach to Dihydrofurocoumarins via Palladium-Catalyzed Annulation of 1,3-Dienes by <i>o</i>-Iodoacetoxycoumarins
作者:Roman V. Rozhkov、Richard C. Larock
DOI:10.1021/jo034571w
日期:2003.8.1
by o-iodoacetoxycoumarins provides an efficient method for the synthesis of biologically interesting dihydrofurocoumarins. The presence of the acetyl group on the phenolic oxygen and the use of silver carbonate as a base are crucial for this process. This reaction is very general and regio- and stereoselective, and a widevariety of terminal, cyclic, and internal 1,3-dienes can be utilized. Derivatization
Synthesis of Dihydrofurocoumarins via Palladium-Catalyzed Annulation of 1,3-Dienes by <i>o</i>-Iodoacetoxycoumarins
作者:Roman V. Rozhkov、Richard C. Larock
DOI:10.1021/ol027342p
日期:2003.3.1
text] A variety of biologically interesting dihydrofurocoumarins have been synthesized in high yields by the palladium-catalyzed annulation of 1,3-dienes by o-iodoacetoxycoumarins. This reaction is very general and regioselective, and a wide variety of terminal, cyclic, and internal 1,3-dienes can be utilized.
Absolute stereochemistry of dihydrofuroangelicins bearing C-8 substituted double bonds: a combined chemical/exciton chirality protocolElectronic supplementary information (ESI) available: Relative energies and relevant geometrical parameters of DFT-optimized structures of sty-2 and sty-5 (Table ESI1). Calculated and experimental 3JMe8,H9a and 3JMe8,H9b values (in Hz) for sty-2 and sty-5 (Table ESI2). UV absorption spectrum of 7-hydroxy-4-methylcoumarin in CH3CN (Fig. ESI1). Description of the procedure for estimating transition dipole moment positions from excited-states calculations. See http://www.rsc.org/suppdata/ob/b3/b312542d/
作者:Katsunori Tanaka、Gennaro Pescitelli、Lorenzo Di Bari、Tom L. Xiao、Koji Nakanishi、Daniel W. Armstrong、Nina Berova
DOI:10.1039/b312542d
日期:——
now been achieved for a series of dihydrofuroangelicins bearing a variety of C-8 substituted doublebonds, synthesized in the racemic form and resolved through enantioselective chromatography. A combined chemical/chiroptical protocol has been developed in which the C[double bond, length as m-dash]C doublebonds are replaced with a styrenoid chromophore through either (i) cross metathesis, (ii) Heck reaction