Synthesis of a Chiral Precursor for No-Carrier-Added (NCA) PET Tracer 6-[18F]Fluoro-L-dopa Based on Regio- and Enantioselective Alkylation of 2,4-Bis(chloromethyl)-5-iodoanisole
A highly chemoselective perfluoroalkylation reaction of aromatic halides is reported. Thermally stable perfluoroalkylzinc reagents, generated by a rapid halogen–zinc exchange reaction between diorganozinc and perfluoroalkyl halide species, couple with a wide range of aryl halides in the presence of a copper catalyst, in moderate to high yields. Good stability of the perfluoroalkylzinc species was indicated
作者:Sheng-Long Fang、Meng-Xue Jiang、Shuo Zhang、Yong-Jie Wu、Bing-Feng Shi
DOI:10.1021/acs.orglett.9b01511
日期:2019.6.21
A scalable and unified strategy is described for the synthesis of (−)-quinocarcin, an important tetrahydroisoquinoline antitumor alkaloid. The strategy allows the practical formalsynthesis of (−)-quinocarcin in 13 steps and 4.8% overall yield using N-phthaloyl-l-alanine as a chiral pool. It features the gram-scale and stereoselectivesynthesis of the tetrahydroisoquinoline moiety (AB ring) via Pd-catalyzed
Dearomative Access to (−)-Thebaine and Derivatives
作者:Zachary A. Tolchin、Dallas M. Dukes、Leanna M. Gharbaoui、Joel M. Smith
DOI:10.1021/acs.orglett.3c03270
日期:2023.12.1
hinging on the dearomatization and coupling of simple aromatic starting materials. This provides divergent access to two unnatural opioid derivatives and is aimed at the long-term development of synthetic opioid analogs of the “wonderdrug” Naloxone. Additionally, a formal enantioselective synthesis of all reported targets is disclosed that leverages a catalytic asymmetric dearomatization via anion-pairing