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。
Enantiopure DAVA-derivatives-part III. Synthesis of all 4 stereoisomers of 2-methyl-4-hydroxy-5-aminopentanoic acid (2-Me-4-OH-DAVA).
作者:Claus Herdeis、Karen Lütsch
DOI:10.1016/s0957-4166(00)86022-x
日期:1993.1
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.
Studies of zoanthamine alkaloids. Enantiocontrolled construction of the tetracyclic hemi-aminal core
作者:David R. Williams、Guillermo S. Cortez
DOI:10.1016/s0040-4039(98)00369-4
日期:1998.4
A concise enantiocontrolled synthesis of the enamine-aminal heterocyclic core found in the zoanthamine alkaloids is presented. Conjugate addition of a chiral imine provides for excellent diastereofacial selectivity in the generation of the quaternary C-9 asymmetry, of 4. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthetic studies of zoanthamine/norzoanthamine alkaloids: Advanced intermediate for the heterocyclic aminal core
An advancedintermediate for the heterocyclic aminal core of zoanthaminelnorzoanthamine alkaloids was prepared in an enantio and stereoselective manner. Contiguous quaternary chiral centers were selectively constructed utilizing a stereoselective cuprate addition to the readily available (+)-Wieland-Miescher ketone.