Hydroxymethylated cyclic α-amino acid dipeptides by ruthenium ring closing metathesis
作者:Kristin Hammer、Kjell Undheim
DOI:10.1016/s0957-4166(98)00248-1
日期:1998.7
Stereoselective syntheses of cyclic α-amino-β-hydroxymethylcyclohexene-α-carboxylic acids are described. The acids were isolated as dipeptides. RCM reactions were effected by Ru(II)-catalysis on hydroxymethylated dienes. The diene substrates were available in stereochemically pure form by stepwise alkylations of (R)-2,5-dihydro-3,6-dimethoxy-2-isopropylpyrazine with 4-bromo-1-butene and vinyloxirane
描述了环状α-氨基-β-羟甲基环己烯-α-羧酸的立体选择性合成。分离出酸为二肽。RCM反应是通过Ru(II)催化在羟甲基化的二烯上进行的。通过(R)-2,5-二氢-3,6-二甲氧基-2-异丙基吡嗪与4-溴-1-丁烯和乙烯基环氧乙烷的逐步烷基化,可获得立体化学纯形式的二烯底物。