Ru(II)-catalyzed ring closing metathesis in stereoselective syntheses of constrained homoserine analogues
作者:Kristin Hammer、Christian Rømming、Kjell Undheim
DOI:10.1016/s0040-4020(98)00626-7
日期:1998.9
Stereoselective syntheses of cyclic alpha-amipo-gamma-hydroxycyclohexene- and cycloheptene-alpha-carboxylic acids are described. RCM cyclization reactions were effected by Ru(II)-catalysis on sterically homogenous hydroxylated dienes. The diene substrates were available by stepwise, stereoselective alkylations of (R)-2,5-dihydro-3,6-dimethoxy-2-isopropylpyrazine with bromoalkenes, ethylene oxide and subsequent transformations. (C) 1998 Elsevier Science Ltd. All rights reserved.