J. Bodi et al., 3-PENTYL (PEN) GROUP AS A NEW BASE-RESISTANT SIDE-CHAIN PROTECTING GROUP FOR TYROSINE, Tetrahedron letters, 39(39), 1998, pp. 7117-7120
The 3-pentyl (Pen) group is a new base-resistant protecting group for
tyrosine. It is sufficiently stable in 50% TFA/DCM and completely stab
le towards 20% piperidine/DMF but is readily cleavable by the standard
HF procedure without the formation of any significant amount of alkyl
tyrosine rearrangement product. (C) 1998 Elsevier Science Ltd. All rig
hts reserved.