Active Cobalt Catalyst for the Cleavage of Benzyl Ether
作者:Bo Wang、Zhaojun Yin、Yangbing Li、Ting-Xiang Yang、Xiang-Bao Meng、Zhong-Jun Li
DOI:10.1021/jo2018284
日期:2011.11.18
An improved method for the deprotection of benzylethers using a catalytic amount of Co2(CO)8 in the presence of Me2PhSiH and CO (1 atm) is described. The deprotection reaction is compatible with double bond or sulfur-containing substrates. The method also tolerates other functional groups, such as Ac, Piv, and Bz, and shows potential selectivity in perbenzylated monosaccharides.
Scope and limitations of the debenzylation conditions for aryl benzyl ether, which was developed during our synthetic studies on yatakemycin, were investigated. The chemoselective debenzylation proceeds at low temperature with a combination of BCl(3) and pentamethylbenzene as a cation scavenger in the presence of various functional groups.