Lanthanum trichloride: an efficient Lewis acid catalyst for chemo and regioselective enamination of β-dicarbonyl compounds

General Papers ARKIVOC 2007 (xiii) 204-209 Table 1. Lanthanum trichloride catalyzed enaminones synthesis Entry Amine Diketo compound Product Reaction Yield Time (h) (%) OO NH O NH2 a 3.0 93 OEt OEt NH2 OO b 2.5 91 NH O OEt OEt OO NH O c 3.0 91 NH2 OEt OEt NH2 OO d 4.0 88 NH O OEt OEt OO NH O NH2 e 3.5 92 NH2 OO f 3.0 90 NH O OO NH O g 3.5 89 NH2 NH2 OO h 4.5 86 NH O OO NH2 NH O i 4.0 92 OBn OBn OO NH2 j 3.5 90 OBn NH O OBn OO NH O k 4.0 89 NH2 OBn OBn NH2 OO l NH O 5.0 85 OBn OBn ISSN 1424-6376 Page 206 ©ARKAT USA, Inc.