In a single step, several variously functionalized [RuCp*(η6-arene)]+ sandwichcomplexes have been prepared starting from RuCl3·xH2O in yields ranging from 35 to 80%, referring to ruthenium. The protocol covers the preparation of valuable [RuCp*]+-complexed amino acids. In comparative experiments starting from the oligomer [RuCp*Cl2]n and using methanol/methanolate as the reducing agent, the formation
Synthesis of 3,4-Dihydroisoquinolin-1-ones from<i>N</i>-Boc-(β-Arylethyl)carbamates via Isocyanate Intermediates
作者:Jinkyung In、Soonho Hwang、Changhun Kim、Jae Hong Seo、Sanghee Kim
DOI:10.1002/ejoc.201201408
日期:2013.2
reaction conditions for the regioselectivesynthesis of isoquinolin-1-ones and related fused-ring heterocycles from N-Boc-protected (β-arylethyl)carbamates are described. The reactions involved the use of Tf2O and 2-chloropyridine and isocyanates are likely to be key intermediates. The method was extended to substrates bearing less nucleophilic aryl moieties by using Lewisacid additives, such as BF3·Et2O