A copper-mediated oxidative C–H/N–H annulation of aromatic amides with dialkyl malonates has been presented to afford synthetically valuable dihydrobenzoindoles and isoindolinones. The reaction proceeds through direct oxidative C(sp2)–H/C(sp3)–H coupling followed by an intramolecular N–H/C(sp3)–H dehydrogenative coupling to deliver the target motifs with broad scope and functional group tolerance.
Photostable broad-spectrum organic sunscreen compositions comprising a UV-A sunscreen, such as Avobenzone, a photostabilizer, a UV-B liquid organic sunscreen, and a solubilizer and further enhancing the photostability by encapsulation using a sol-gel process.
PHOTO STABLE ORGANIC SUNSCREEN COMPOUNDS WITH ANTIOXIDANT PROPERTIES AND COMPOSITIONS OBTAINED THEREFROM
申请人:EM Industries
公开号:US20030108492A1
公开(公告)日:2003-06-12
A compound of formula I
1
wherein
A is a moiety which provides UV absorbing activity to the compound of formula I that comprises 1 divalent group or 2 monovalent groups, with at least one group having carbonyl (C═O) functionality, and each R is independently linear or branched C
1
-C
8
alkyl. Sunscreen formulations which contain these compounds and methods using these compounds to prepare formulations are also provided.
The present invention relates to a sunscreen capsule comprising i) at least one UV-A organic sunscreen and ii) at least one photostabilizer; furthermore it relates to a composition for topical application comprising these capsule and methods of production and use of these capsules and compositions.
Rh-catalyzed weak and traceless directing-group-assisted cascade C–H activation and annulation of sulfoxoniumylides with vinyl cyclopropanes as a coupling partner have been accomplished to furnish functionalized cyclopropane-fused tetralones at moderate temperature. The C–C bond formation, cyclopropanation, functional group tolerance, late-stage diversifications of drug molecules, and scale-up are