BOC-D-2-Methylphe

White powder

General procedure: (S)-2-((tert-Butoxycarbonyl)amino)-3-phenylpropanoic acid (compound 5a, 203.6 mg, 0.768 mmol) in DMF (5 mL) was added HOBt (283.2 mg, 2.10 mmol) and EDCI (257.8 mg, 1.396 mmol). After stirring for 30 min compound 4 (187.2 mg, 0.698 mmol) and additional TEA (0.30 mL, 2.10 mmol) were added. This solution was allowed to stir at room temperature for 20 h and then the saturated NaHCO3 was added. The mixture was extracted with EtOAc and washed with saturated NaCl, dried over Na2SO4 and concentrated. The residue was purified with flash chromatography on silica gel, eluted with a mixture of PE/EA (4/1, v/v) to afford 6a (130 mg, 54%) as a white solid.Preparative 1-Benzyl-3(S)-(2'-methylbenzyl)-piperazine-2, 5-dione A solution of Boc-2-methyl-L-phenylalanine (2.79 g, 10 mmol) in DMF (25 mL) was treated sequentially with HOBt (2.03 g, 15 mmol), DIEA (4.35 mL, 25 mmol), N-benzylglycine ethyl ester (2.03 mL, 11 mmol), and HBTU (5.69 g, 15 mmol). The resulting solution was allowed to stir for 16 hr after which time the mixture was poured onto a mixture of 1 N HCl (50 mL) and EtOAc (50 mL). The organic portion was separated and further extracted with a saturated NaHCO3 solution (50 mL) follow by brine (50 mL). The organic phase was dried over MgSO4, filtered and evaporated to an oil, which was purified by silica gel flash chromatography with 20% then 30% EtOAc/hexanes as eluant to afford product as a solid (4.31 g, 95%). LC/MS 7.43 min, [M+1]+ 455.

peptide synthesis

Molecular Weight:279.33
XLogP3:2.9
Hydrogen Bond Donor Count:2
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:6
Exact Mass:279.14705815
Monoisotopic Mass:279.14705815
Topological Polar Surface Area:75.6
Heavy Atom Count:20
Complexity:348
Defined Atom Stereocenter Count:1
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes