released through an enzyme‐initiated 1,6‐elimination reaction. Optimisation of the stereoelectronic properties and of the binding interactions at the enzyme active site led to substrates with highaffinity and promising selectivity.
Abstract(3‐(3‐Bromo‐4‐hydroxy‐S‐methoxy‐phenyl)alanine (Ie) exerts a long‐acting antihypertensive effect in rats and dogs : its synthesis and its optical resolution have already appeared in the literature. 1 Ten new mono‐ and polybrominated phenylalanines with hydroxy‐ and/or methoxy‐groups are here described. These unnatural amino‐acide were synthesized by direct bromination, or via the acetamidomalonic esters (V), or via the azlactones (VI) and the corresponding phenylpyruvic acids (VIII).
Darstellung und Oxydation von Hydroxybenzylalkoholen
作者:P. Claus、P. Schilling、J. S. Gratzl、K. Kratzl
DOI:10.1007/bf00905194
日期:——
Cascade Synthesis of Polyoxygenated 6<i>H,</i>11<i>H</i>-[2]Benzopyrano-[4,3-<i>c</i>][1]benzopyran-11-ones
作者:Mikael I. Naumov、Sergey A. Sutirin、Andrey S. Shavyrin、Olga G. Ganina、Irina P. Beletskaya、Véronique Bourgarel-Rey、Sébastien Combes、Jean-Pierre Finet、Alexey Yu. Fedorov
DOI:10.1021/jo062592v
日期:2007.4.1
2-(Methoxymethoxymethyl)aryllead triacetates, obtained in situ from the corresponding arylboronic acids, reacted with 4-hydroxycoumarins, leading to 3-(2-methoxymethoxymethyl)aryl-4-hydroxycoumarin derivatives in good to high yields. These compounds underwent a cascade sequence of reactions, deprotection-halogenation-annulation, to afford polyoxygenated tetracyclic 6H,11H-[2]benzopyrano-[4,3-c] [1]benzopyran-11-ones in good yields. Some compounds showed a moderate cytotoxicity against human epithelial mammary HBL100 cells.
SAA J. M.; MOREY J.; COSTA A., TETRAHEDRON LETT., 27,(1986) N 42, 5125-5128