Lanthanum(III) Isopropoxide Catalyzed Chemoselective Transesterification of Dimethyl Carbonate and Methyl Carbamates
作者:Manabu Hatano、Sho Kamiya、Katsuhiko Moriyama、Kazuaki Ishihara
DOI:10.1021/ol102754y
日期:2011.2.4
carbonate and much less reactive methyl carbamates with primary (1°), secondary (2°), and tertiary (3°) alcohols was established with the use of a lanthanum(III) complex, which was prepared in situ from lanthanum(III) isopropoxide (3 mol %) and 2-(2-methoxyethoxy)ethanol (6 mol %). In particular, corresponding carbonates and carbamates obtained were of synthetic utility from the viewpoint of the selective protection
使用镧(III)配合物,建立了反应性较低的碳酸二甲酯和反应性较低的氨基甲酸甲酯与伯(1°),仲(2°)和叔(3°)醇的实际酯交换反应原位由异丙醇镧(III)(3摩尔%)和2-(2-甲氧基乙氧基)乙醇(6摩尔%)原位制备。特别地,从对1°-,2°-和3°-醇的选择性保护和/或脱保护的观点来看,获得的相应的碳酸盐和氨基甲酸酯具有合成用途。