2-(Prenyloxymethyl)benzoyl (POMB) group: a new temporary protecting group removable by intramolecular cyclization
作者:Jean-Michel Vatèle
DOI:10.1016/j.tet.2007.08.065
日期:2007.11
2-(Prenyloxymethyl)benzoates can be prepared from alcohols and readily available 2-(prenyloxymethyl)benzoic acid by standard acylation techniques or by Mitsunobu reaction with inversion of configuration. The POMB group can be cleaved first by oxidative removal of the prenyl group with DDQ followed by lactonization with expulsion of the alcohol catalyzed by Yb(OTf)(3). These reaction conditions are compatible with the presence of a large number of common protecting groups. (c) 2007 Elsevier Ltd. All rights reserved.
2-(Prenyloxymethyl)benzoyl (POMB) as a new temporary protecting group for alcohols
作者:Jean-Michel Vatèle
DOI:10.1016/j.tetlet.2005.02.008
日期:2005.3
The 2-(prenyloxymethyl)benzoyl (POMB) group was introduced in high yields to hydroxyl functions using the crystalline reagent, 2-(prenyloxymethyl)benzoic acid, in the presence of dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP). 2-(Prenyloxymethyl)benzoic acid is readily available, in two steps, from phthalide in 65% overall yield. The POMB group can be cleaved, in two steps, by treatment