Accessing Illusive <i>E</i> Isomers of α-Ester Hydrazones via Visible-Light-Induced Pd-Catalyzed Heck-Type Alkylation
作者:Nikita Kvasovs、Vladimir Gevorgyan
DOI:10.1021/acs.orglett.2c01409
日期:2022.6.17
been developed. This method operates via generation of a nucleophilic carbon-centered radical from alkyl bromide, iodide, or redox-active ester, followed by its addition to hydrazone, and a subsequent desaturation by palladium. The majority of products have E configuration, which are inaccessible by conventional condensation methods. In addition, a sequential C,N-alkylation protocol has been developed:
[reaction: see text] The total synthesis of gymnorrhizol, a naturally occurring macrocyclicpolydisulfide with a new skeleton and a potent proteintyrosinephosphatase 1B inhibitor, was prepared in three steps, starting from (R)-1-bromo-3-chloroisopropanol and 1,3-dichloropropan-2-ol.
[反应:请参阅文字]从(R)-1-溴-3-氯异丙醇和1, 3-二氯丙烷-2-醇。
Enantiospecific synthesis and gas chromatographic resolution of (R)-(-)- and (S)-(+)-1,2-dibromo-3-chloropropane