Multi-step reaction with 7 steps
1: 93 percent
2: AcOH, conc. H2SO4 / CH2Cl2 / 16 h / 4 °C
3: 68.5 percent / hexamethyldisilazane, chlorotrimethylsilane, trifluoromethanesulfonic acid / acetonitrile / 12 h / Heating
4: 63 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene (DBU) / toluene / 1.5 h / 90 °C
5: (dimethylamino)pyridine / acetonitrile
6: 85 percent / tributyltin hydride, AIBN / toluene / 120 °C
7: 1.) LiN3, benzoic acid, 2.) 0.1 M NaOCH3 / 1.) DMF, 120 deg C, 12 h, 2.) MeOH
With
dmap; chloro-trimethyl-silane; lithium azide; 2,2'-azobis(isobutyronitrile); trifluorormethanesulfonic acid; sulfuric acid; tri-n-butyl-tin hydride; sodium methylate; acetic acid; 1,8-diazabicyclo[5.4.0]undec-7-ene; 1,1,1,3,3,3-hexamethyl-disilazane; benzoic acid;
In
dichloromethane; toluene; acetonitrile;
DOI:10.1021/jm00094a014