Sequential removal of the benzyl-type protecting groups PMB and NAP by oxidative cleavage using CAN and DDQ

The selective cleavage of the PMB (4-methoxybenzyl) group in the presence of the NAP (2-naphthylmethyl) group was achieved using CAN with a range of mono-saccharides. The NAP group can then be removed selectively in the presence of a benzyl group using DDQ. This provides a strategy for sequential deprotection of hydroxyl groups. (C) 2001 Elsevier Science Ltd. All rights reserved.