Using Pd/HCOOCs as a surrogate reagentssynthesis of saturated N-heterocycles was described from nitroaromatics as starting materials. The developed new reaction conditions exclude the generally used toxic reagents like carbon monoxide as deoxygenative agent. The developed protocol permits the synthesis privileged bioactive N-heterocyclic scaffolds in good yields and selectivity.
Using the transformation of allyl 2-nitrophenyl thioethers to 3,4-dihydro-2H-1,4-benzothiazines as an example the reductive cyclization of Ï-nitroalkenes to saturated N-heterocycles can be performed highly selective and with high yields if a combination of MoO2Cl2(dmf)2 as a catalyst and Ph3P as reducing agent are employed.
From the study of naturally occurring N-allylated phenazines towards new Pd-mediated transformations
作者:Elena Merişor、Uwe Beifuss
DOI:10.1016/j.tetlet.2007.09.045
日期:2007.11
New Pd-mediated reductive heteroannulations of N-allyl diphenylamines accessible through Pd-catalyzed N-arylation and of O-allylethers are reported. (c) 2007 Elsevier Ltd. All rights reserved.