Synthesis of 3-(2-hydroxy-1-phenylethyl)- and 3-(2-hydroxy-2-phenylethyl)adenine, DNA adducts derived from styrene
作者:Jan Krouželka、Igor Linhart、Tomáš Tobrman
DOI:10.1002/jhet.5570450325
日期:2008.5
3-(2-Hydroxy-2-phenylethyl)- and 3-(2-hydroxy-1-phenylethyl)adenine, DNA adducts derivedfrom styrene, along with their 9-substituted analogues were prepared by alkylation of 8-bromoadenine with corresponding allyl-protected bromohydrins followed by a new deallylation procedure using tetrakis(triphenylphosphine)palladium catalyzed reductive cleavage by poly(methylhydrosiloxane) in the presence of p-toluenesulphonic
An efficient one-pot sequence comprising a PRE-mediated radical 5-exo-cyclization, a radical carbonylation, a nitroxide trapping reaction, and a subsequent acid-catalyzed Friedel-Craft-type acylation provides a new entry into 3,4-cyclopenta-1-tetral ones. Eight examples are presented.
Synthesis of 7-Hydroxy(phenyl)ethylguanines by Alkylation of 2-Amino-6-chloropurine with Allyl-Protected Bromohydrins
[GRAPHICS]Protecting the hydroxyl group in both 2-bromo-2-phenylethanol and 2-bromo-1-phenylethanol enhanced the alkylation of 2-amino-6-chloropurine to give corresponding 7- and 9-alkylated products. Subsequent hydrolysis and deprotection led to 7- and 9-hydroxy(phenyl)ethylguanines. 7-Hydroxy(phenyl)ethylguanines are major guanine adducts formed by interaction of styrene 7,8-oxide with DNA.