Phosphine-Catalyzed Enantioselective γ-Addition of 3-Substituted Oxindoles to 2,3-Butadienoates and 2-Butynoates: Use of Prochiral Nucleophiles
作者:Tianli Wang、Weijun Yao、Fangrui Zhong、Guo Hao Pang、Yixin Lu
DOI:10.1002/anie.201307757
日期:2014.3.10
first phosphine‐catalyzed enantioselective γ‐addition with prochiral nucleophiles and 2,3‐butadienoates as the reaction partners has been developed. Both 3‐alkyl‐ and 3‐aryl‐substitutedoxindoles could be employed in this process, which is catalyzed by a chiral phosphine that is derived from an amino acid, thus affording oxindoles that bear an all‐carbon quaternary center at the 3‐position in high yields
The synthesis and anti-microbial activity of new spiro-β-lactams is reported. The design of the new molecules was based on the structural modulation of two previously identified lead spiro-penicillanates with dual activity against HIV and Plasmodium. The spiro-β-lactams synthesized were assayed for their in vitro activity against HIV-1, providing relevant structure-activity relationship information
报道了新型螺-β-内酰胺的合成和抗微生物活性。新分子的设计基于对先前鉴定出的两种对 HIV 和疟原虫具有双重活性的螺旋青霉酸铅的结构调节。分析了合成的螺-β-内酰胺类化合物对 HIV-1 的体外活性,提供了相关的构效关系信息。在测试的化合物中,两种螺环戊烯基-β-内酰胺被鉴定为对 HIV-1 具有显着的纳摩尔活性。此外,相同的分子显示出有希望的抗疟原虫活性,抑制疟原虫感染的肝脏和血液阶段。
Phosphine-catalyzed dearomative [3+2] annulation of 3-nitroindoles and allenoates
作者:Kui Liu、Gang Wang、Shao-Jie Cheng、Wen-Feng Jiang、Cheng He、Zhi-Shi Ye
DOI:10.1016/j.tetlet.2019.06.016
日期:2019.7
dearomative [3+2] annulation of 3-nitroindoles with allenoates has been successfully developed, providing a facile access to cyclopenta[b]indolines with good to excellent yields and high diastereoselectivities. This strategy features mild reaction conditions, high functional group tolerance, and scalability. Additionally, the 2-nitrobenzofuran and 2-nitrobenzothiophene were good dearomative [3+2] annulation
已经成功开发了有效的膦催化的3-硝基吲哚与脲基甲酸酯的脱芳族环氧化物[3 + 2]环化反应,可轻松获得环戊二烯[ b ]吲哚,并具有良好或优异的收率和较高的非对映选择性。该策略具有温和的反应条件,较高的官能团耐受性和可扩展性。此外,2-硝基苯并呋喃和2-硝基苯并噻吩是良好的脱芳香性[3 + 2]环空伙伴。
An intramolecular Heck reaction of enol ethers involving β-alkoxyl elimination followed by the β-hydride elimination process: access to (<i>Z</i>)-<i>ortho</i>-formyl/keto-cinnamates
作者:Manman Sun、Haibo Wu、Haijian Wu、Zhiming Wang
DOI:10.1039/c9cc08133j
日期:——
A highly regio- and stereoselectiveintramolecular Heck reaction of enol ethers involving β-alkoxyl elimination followed by the β-hydride elimination process has been developed. Various o-iodobenzyl enol ethers derived from allenoates or alkynoates are found to be efficient substrates for the syntheses of (Z)-ortho-formyl/keto-cinnamates. It is the first attempt to realize the β-alkoxy elimination
Asymmetric Aldol Reaction of Allenoates: Regulation for the Selective Formation of Isomeric Allenyl or Alkynyl Aldol Adduct
作者:Jiyun Bang、Hyuna Kim、Jihyun Kim、Chan-Mo Yu
DOI:10.1021/acs.orglett.5b00454
日期:2015.3.20
A highly stereoselective synthesis of 3-butynyl-threo-aldol adducts is achieved from the reaction of allyl allenoate with a chiral bromoborane in the presence of iPr2NEt, followed by addition of BF3·OEt2 as an additive to scavenge excess base and then aldehydes, whereas isomeric allenyl aldol adducts are formed in the absence of a Lewis acid additive from methyl allenoate.