Baker’s yeast-mediated enantioselective synthesis of the bisabolane sesquiterpenes (+)-curcuphenol, (+)-xanthorrhizol, (−)-curcuquinone and (+)-curcuhydroquinone
作者:Claudio Fuganti、Stefano Serra
DOI:10.1039/b006141g
日期:——
yields and shows complete enantioselectivity in the formation of the (S)-(+) isomers. Enantiopure 6a–c are versatile chiral building blocks for the synthesis of bisabolane sesquiterpenes. Their usefulness is shown in the preparation of (S)-(+)-curcuphenol, (S)-(+)-xanthorrhizol, (S)-(−)-curcuquinone and (S)-(+)-curcuhydroquinone.
The First Total Synthesis of the Antimicrobial Sesquiterpenes (±)-Enokipodins A and B
作者:A. Srikrishna、M. Srinivasa Rao
DOI:10.1055/s-2003-45003
日期:——
Efficient first total synthesis of antimicrobial sesquiterpenes enokipodins A and B (1 and 2, respectively) and formal total synthesis of cuparene-1,4-diol (5) and cuparene-1,4-quinone (7) have been accomplished starting from 2,5-dimethoxy-4-methylacetophenone employing Claisen rearrangement and ring-closing metathesis reaction as key steps.
以 2,5-二甲氧基-4-甲基苯乙酮为起点,以克莱森重排和闭环偏析反应为关键步骤,首次完成了抗菌倍半萜烯 enokipodins A 和 B(分别为 1 和 2)的高效全合成,并正式完成了铜蒈烯-1,4-二醇(5)和铜蒈烯-1,4-醌(7)的全合成。
The first total synthesis of (+/-)-lagopodin A and a formal total synthesis of enokipodins A and B is described. The requisite precursors containing two vicinal quaternary carbon atoms were assembled employing Claisen rearrangement and an RCM reaction as key steps starting from 2,5-dimethoxy-4-methylacetophenone. (c) 2006 Elsevier Ltd. All rights reserved.
Srikrishna; Rao, M. Srinivasa, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2010, vol. 49, # 10, p. 1363 - 1371
作者:Srikrishna、Rao, M. Srinivasa
DOI:——
日期:——
Highly Enantioselective Iridium-Catalyzed Hydrogenation of α,β-Unsaturated Esters
作者:Jia-Qi Li、Xu Quan、Pher G. Andersson
DOI:10.1002/chem.201200907
日期:2012.8.20
α,β‐Unsaturated esters have been employed as substrates in iridium‐catalyzed asymmetric hydrogenation. Full conversions and good to excellent enantioselectivities (up to 99 % ee) were obtained for a broad range of substrates with both aromatic‐ and aliphatic substituents on the prochiral carbon. The hydrogenated products are highly useful as building blocks in the synthesis of a variety of natural