Stereoselective Synthesis of C5−C20 and C21−C34 Subunits of the Core Structure of the Aplyronines. Applications of Enantioselective Additions of Chiral Allenylindium Reagents to Chiral Aldehydes
作者:James A. Marshall、Brian A. Johns
DOI:10.1021/jo991689x
日期:2000.3.1
The stereoselective synthesis of a C5-C20 and a C21-C34 subunit of the aplyronine family of polyketide marine macrolides has been achieved. These subunits contain all 15 stereocenters of the core structure. Six of the 15 stereocenters were introduced through enantioselective and diastereoselective additions of chiral allenylindium reagents to alpha-methyl-beta-oxygenated propionaldehydes. The products
已经实现了聚酮化合物海洋大环内酯的鸟嘌呤碱家族的C5-C20和C21-C34亚基的立体选择性合成。这些亚单位包含核心结构的所有15个立体中心。通过将手性烯丙基铟试剂对映选择性和非对映选择性添加到α-甲基-β-氧化丙醛中,引入15个立体中心中的6个。这些加成产物通过涉及在加成反应中产生的末端炔基取代基的反应进一步转化。与该方法的以前的应用不同,本发明的合成方法采用Pd(0)催化的手性烯基钯中间体进行金属转移以原位生成手性烯基铟试剂。