derivatives (10), acid (11), esters (12) and amides (13) were synthesized starting from 2. 7-Ethyl- (4b) and 7-propylcamptothecin (4c), acyloxymethyl compounds 6a, 6c and ethyl ester (12b) exhibited higher antitumor activity than 1 against L1210 in mice.
Photoredox-mediated remote C(sp<sup>3</sup>)–H heteroarylation of free alcohols
作者:Guo-Xing Li、Xiafei Hu、Gang He、Gong Chen
DOI:10.1039/c8sc04134b
日期:——
We report an efficient and economical method for remote δ C(sp3)–H heteroarylation of free aliphatic alcohols using a hypervalent iodine PFBI-OH oxidant under photoredox catalysis. The reaction sequence involves in situ alcoholysis of PFBI-OH with alcohol, generation of an alkoxy radical intermediate by SET reduction, 1,5-HAT, and Minisci-type C–C bond formation. This method uses a slight excess of