Multi-step reaction with 10 steps
1.1: tetrahydrofuran; dichloromethane / 18 h / 0 - 25 °C
1.2: 2 h / 60 °C
2.1: potassium tert-butylate / tetrahydrofuran / 0.25 h
2.2: 48 h / 20 °C
3.1: sodium methylate / methanol / 18 h / 25 °C
4.1: 15 h / 25 °C
5.1: methylamine / ethanol / 2 h / 40 °C
6.1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / acetonitrile / 1 h / 80 °C
7.1: tetrahydrofuran / 18 h / 0 - 40 °C
8.1: pyridinium p-toluenesulfonate / water; acetone / 18 h / Reflux
9.1: toluene-4-sulfonic acid / toluene / 1 h / Dean-Stark
10.1: (+/-)-2-(tert-butyl)-3-methylimidazolidin-4-one; diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate; trifluoroacetic acid / chloroform / 18 h / 0 - 25 °C
With
diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate; potassium tert-butylate; sodium methylate; pyridinium p-toluenesulfonate; (+/-)-2-(tert-butyl)-3-methylimidazolidin-4-one; toluene-4-sulfonic acid; methylamine; trifluoroacetic acid; 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione;
In
tetrahydrofuran; methanol; ethanol; dichloromethane; chloroform; water; acetone; toluene; acetonitrile;
DOI:10.1021/acs.orglett.6b01253