[Fe(diene)(CO)3] complexes as a guide in stereocontrol. Applications to the asymmetric synthesis of natural products
作者:Chuuzo Iwata、Yoshiji Takemoto
DOI:10.1039/cc9960002497
日期:——
The ability of iron tricarbonyl units to control the region- and stereo-chemistry of nucleophilic addition to a neighbouring CX (X = O, N) double bond and 1,5-nucleophilic substitution via a η5-cation intermediate are described. We investigated the potential of acyclic [Fe(diene)(CO)3] complexes as chiral auxiliaries for the asymmetric synthesis of natural products. The asymmetric syntheses of (+) and (–)-frontalin, a hydroxyethylidene dipeptide isostere, a piperidine alkaloid (SS20846A), and N-Boc-O-Me-(2R,3S,5E,7E)-2-aminotetradeca- 5,7-dien-3-ol were achieved by using the stereodirecting ability and mobility of the Fe(diene)(CO)3 group. In addion, we developed an efficient method for synthesizing chiral dienal Fe(CO)3 complexes, which are versatile starting materials for the asymmetric synthesis of the biologically active natural products described above.
三羰基铁单元的区域选择性和立体化学控制能力,可实现对邻近 CX(X = O,N)双键的亲核加成以及通过 η5-阳离子中间体进行的 1,5-亲核取代反应。我们研究了无环 [Fe(二烯)(CO)3] 配合物作为手性辅基用于天然产物的不对称合成潜力。通过利用 Fe(二烯)(CO)3 基团的立体导向能力和迁移性,成功实现了 (+) 和 (–)-frontalin(一种羟乙叉二肽类似物)、一种哌啶生物碱(SS20846A)以及 N-Boc-O-Me-(2R,3S,5E,7E)-2-氨基十四碳-5,7-二烯-3-醇的不对称合成。此外,我们发展了一种高效合成手性二烯醛 Fe(CO)3 配合物的方法,这些配合物作为多功能起始材料,可用于上述生物活性天然产物的不对称合成。