(+)- and (−)-Mutisianthol: First Total Synthesis, Absolute Configuration, and Antitumor Activity
摘要:
The first synthesis of the natural product (+)-mutisianthol was accomplished in 11 steps and in 21% overall yield from 2-methylanisole. The synthesis of its enantiomer was also performed in a similar overall yield. The absolute configuration of the sesquiterpene (+)-mutisianthol was assigned as (1S,3R). Key steps in the route are the asymmetric hydrogenation of a nonfunctionalized olefin using chiral iridium catalysts and the ring contraction of 1,2-dihydronaphthalenes using thallium(III) or iodine(III). The target molecules show moderate activity against the human tumor cell lines SF-295, HCT-8, and MDA-MB-435.
Iron-Catalyzed Highly Enantioselective Hydrogenation of Alkenes
作者:Peng Lu、Xiang Ren、Haofeng Xu、Dongpo Lu、Yufeng Sun、Zhan Lu
DOI:10.1021/jacs.1c04773
日期:2021.8.18
for the first time an iron-catalyzed highlyenantioselectivehydrogenation of minimally functionalized 1,1-disubstituted alkenes to accesschiral alkanes with full conversion and excellent ee. A novel chiral 8-oxazoline iminoquinoline ligand and its iron complex have been designed and synthesized. This protocol is operationally simple by using 1 atm of hydrogen gas and shows good functional group tolerance
(+)- and (−)-Mutisianthol: First Total Synthesis, Absolute Configuration, and Antitumor Activity
作者:Graziela G. Bianco、Helena M. C. Ferraz、Arinice M. Costa、Letícia V. Costa-Lotufo、Cláudia Pessoa、Manoel O. de Moraes、Marcus G. Schrems、Andreas Pfaltz、Luiz F. Silva
DOI:10.1021/jo9000405
日期:2009.3.20
The first synthesis of the natural product (+)-mutisianthol was accomplished in 11 steps and in 21% overall yield from 2-methylanisole. The synthesis of its enantiomer was also performed in a similar overall yield. The absolute configuration of the sesquiterpene (+)-mutisianthol was assigned as (1S,3R). Key steps in the route are the asymmetric hydrogenation of a nonfunctionalized olefin using chiral iridium catalysts and the ring contraction of 1,2-dihydronaphthalenes using thallium(III) or iodine(III). The target molecules show moderate activity against the human tumor cell lines SF-295, HCT-8, and MDA-MB-435.
Cobalt-Catalyzed Enantioconvergent Hydrogenation of Minimally Functionalized Isomeric Olefins
作者:Peng Lu、Hongliang Wang、Yihui Mao、Xin Hong、Zhan Lu
DOI:10.1021/jacs.2c08525
日期:2022.9.28
established methods often require geometrically pure olefins. The enantioconvergent reaction provided the possibility to access a single stereoisomer via hydrogenation of E/Z-olefin mixtures; however, a polar functional group next to the carbon–carbon double bond was usually necessary. Here, we reported a cobalt-catalyzed enantioconvergent hydrogenation of readily available minimally functionalized E/Z-olefin
由于对映体纯化合物的高需求,烯烃不对称氢化的研究在药物分子合成和化学工业中都具有重要意义。已建立的方法通常需要几何纯烯烃。对映收敛反应提供了通过氢化E / Z -烯烃混合物获得单一立体异构体的可能性;然而,通常需要在碳-碳双键旁边的极性官能团。在这里,我们报道了一种钴催化的对映收敛氢化容易获得的最小官能化E / Z-烯烃混合物。该策略显示出良好的官能团耐受性,并为对映收敛转化提供了一种替代方法。初步机理研究表明,钴催化异构化是实现收敛转化的关键。