1H-naphtho[2,1-b]thiete and 2H-naphtho[2,3-b]thiete- synthesis and reactivity
作者:Axel Mayer、Herbert Meier
DOI:10.1016/s0040-4039(00)76785-2
日期:1994.4
The title compounds 4 and 8 are obtained by flash vacuum pyrolysis of the corresponding hydroxymethylthionaphthols 3 and 7. Whereas 4 shows a smooth ring opening on heating, 8 is thermally stable but reacts photochemically. The different behavior is explained on the basis of an MNDO calculation. The valence isomers 4′ and 8′ represent thioquinonemethides, which are highly reactive components in [12π
Synthetic Equivalents for Benzo- and Naphthothietes
作者:Herbert Meier、Axel Mayer
DOI:10.1055/s-1996-4211
日期:1996.3
Benzo-condensed 1,3-oxathiin-2-ones 4, 8, 11, 14 were prepared according to the reaction sequences shown in the Schemes 1 and 3. Due to the facile thermal extrusion of CO2 these compounds proved to be very useful synthetic thiete equivalents for the preparation of heterocyclic ring systems containing sulfur. Some examples of hetero Diels-Alder reactions are compiled in the Schemes 2 and 4.
Releasable linkage and compositions containing same
申请人:Alza Corporation
公开号:US20040213759A1
公开(公告)日:2004-10-28
A conjugate comprised of a hydrophilic polymer covalently yet reversibly linked to a amine-, hydroxy- or carboxyl-containing ligand is described. The resulting conjugate is capable of releasing the parent amine, hydroxy, or carboxyl-containing compound via thiol-mediated cleavage. The system allows for delivery of various amino-, hydroxy-, or carboxy-containing drugs in the form of their thiolytically cleavable macromolecular conjugates.