Studies on peptides. CIX. Synthesis of the octatriacontapeptide corresponding to positions 1 to 38 of human parathyroid hormone.

Abstract
The octatriacontapeptide corresponding to positions 1-38 of human parathyroid hormone (hPTH), a half of the whole molecule, was synthesized by assembling 9 peptide fragments in a conventional manner. Arg(mesitylene-2-sulfonyl), a new arginine derivative bearing an acid-labile protecting group, was employed in combination with a new deprotecting procedure with 1 M trifluoromethanesulfonic acid-thioanisole in TFA [trifluoroacetic acid]. The synthetic peptide exhibited an activity of 1400 IU/mg when assayed by the mouse bone adenyl cyclase activity assay.