N-demethylation of (±)-6β-acetoxy-3-tropinone. Synthesis of (±)-6β-acetoxynortropane
作者:Xiao-Shu He、Arnold Brossi
DOI:10.1002/jhet.5570280716
日期:——
Nortropinone 5, prepared from 3 by N-demethylation with trichloroethyl chloroformate, followed by deprotection of carbamate 4 with zinc in acetic acid, served as a starting material to prepare the N-protected 6-acetoxy ketones 7 and 9–12, and alcohols 6 and 8. Nortropane 16 was prepared from 3 by decarbonylation via dithioketal 13 followed by N-demethylation, and from 10 by decarbonylation via dithioketal