PHOTOLYSIS OF PHENACYL ESTERS IN A TWO-PHASE SYSTEM
作者:Radovan Ruzicka、Miroslav Zabadal、Petr Klán
DOI:10.1081/scc-120005943
日期:2002.1
ABSTRACT Phenacylesters are useful photoremovable protecting groups for carboxylic acids in organic synthesis and biochemistry. In this work, simple one-pot arrangements of the phenacyl and 2,5-dimethylphenacyl ester photolysis are proposed. The reactions were performed in both the benzene/water two-phase system and in water. Cetyltrimethylammonium bromide was found to increase substantially the efficiency
2,5-Dimethylphenacyl as a New Photoreleasable Protecting Group for Carboxylic Acids
作者:Petr Klán、Miroslav Zabadal、Dominik Heger
DOI:10.1021/ol005789x
日期:2000.6.1
The 2,5-dimethylphenacyl chromophore, a new photoremovable protectinggroup for carboxylic acids, is proposed. Direct photolysis of various 2,5-dimethylphenacyl esters in benzene or methanol at 254-366 nm leads to the formation of the corresponding carboxylic acids in almost quantitative isolated yields. The photodeprotection is based on efficient intramolecular hydrogen abstraction without the necessity