Enantiopure DAVA-derivatives-part III. Synthesis of all 4 stereoisomers of 2-methyl-4-hydroxy-5-aminopentanoic acid (2-Me-4-OH-DAVA).
摘要:
A stereoselective synthesis of the 4 stereoisomers of 2-methyl-4-hydroxy-5-amino-pentanoic acid namely 2R,4S-9a, 2S,4S-9b, ent-9a and ent-9b is presented, starting from the known lactones S-1 and R-l, which are readily available from L- and D-glutamic acid. Only ent-9b shows affinity for GABA(B)-receptor sites.
Enantiopure DAVA-derivatives-part III. Synthesis of all 4 stereoisomers of 2-methyl-4-hydroxy-5-aminopentanoic acid (2-Me-4-OH-DAVA).
摘要:
A stereoselective synthesis of the 4 stereoisomers of 2-methyl-4-hydroxy-5-amino-pentanoic acid namely 2R,4S-9a, 2S,4S-9b, ent-9a and ent-9b is presented, starting from the known lactones S-1 and R-l, which are readily available from L- and D-glutamic acid. Only ent-9b shows affinity for GABA(B)-receptor sites.
No bones about it: (−)‐Norzoanthamine, a promising candidate for an anti‐osteoporotic drug, was the target of a totalsynthesis (see scheme). The final bisaminal formation with AcOH/H2O gave the DEFG ring, while the cyclization precursor was prepared by installing the remaining bisaminal unit after oxidative cleavage of the cyclopentanol moiety.
毫无保留:(-)-去甲蒽胺是抗骨质疏松药物的有希望的候选者,是总合成的目标(请参阅方案)。最终用AcOH / H 2 O形成的双氨醛形成DEFG环,而环化前体是通过在环戊醇部分的氧化裂解后安装剩余的双氨醛单元而制备的。