p. 3319 - 3324
(2001)N-benzyl-L-valine methyl ester
chloroacetyl chloride
L-Valine methyl ester
benzyl bromide
1-[(3'R,6'S)-1'-benzyl-3'-benzyloxycarbonylmethyl-5'-ethoxy-(6'H)-6'-isopropylpyrazin-3'-yl-2'-one]-3-[(3''R,6''S)-1''-benzyl-5''-ethoxy-3'',6''-dihydro-6''-isopropylpyrazin-3''-yl-2''-one]propane
1-[(3'R,6'S)-3'-allyl-1'-benzyl-5'-ethoxy-(6'H)-6'-isopropylpyrazin-3'-yl-2'-one]-3-[(3''R,6''S)-1''-benzyl-5''-ethoxy-3'',6''-dihydro-6''-isopropylpyrazin-3''-yl-2''-one]propane
1-[(3'R,6'S)-1'-benzyl-3'-chloromethyl-5'-ethoxy-(6'H)-6'-isopropylpyrazin-3'-yl-2'-one]-3-[(3''R,6''S)-1''-benzyl-5''-ethoxy-3'',6''-dihydro-6''-isopropylpyrazin-3''-yl-2''-one]propane
1-[(3'R,6'S)-1'-benzyl-5'-ethoxy-3',6'-dihydro-6'-isopropylpyrazin-3'-yl-2'-one]-3-[(3''R,6''S)-1''-benzyl-5''-ethoxy-3'',6''-dihydro-6''-isopropylpyrazin-3''-yl-2''-one]propane
(6S)-1-benzyl-5-ethoxy-3,6-dihydro-6-isopropylpyrazine-2-one