1-官能化的6-羟基-4-甲基和6,11-二羟基-4-甲基萘[2,3 - g ]异喹啉-5,12-醌的合成
摘要:
以2-甲氧基和2,5-二甲氧基苯乙酮8a和8b为起始原料,通过多步序列获得了1-氯-4-甲基异喹啉-5,8-醌(6)及其6-溴衍生物7 。前一种化合物与高邻苯二甲酸酐的Diels-Alder缩合反应(22)导致两种可能的异构体的混合物:1-氯-11-羟基-4-甲基萘[2,3- g ]异喹啉-5,12-醌(23)和1-氯-6-羟基-4-甲基萘[2,3- g ]异喹啉-5,12-醌(24),该最后的四环氯醌具体地是从6-溴-1-氯-4获得的。 -甲基异喹啉-5,8-醌(7)和高邻苯二甲酸酐。然后,通过硝酸铵氧化或通过苯并环丁烯二酮(28)和1-氯-4-甲基异喹啉-5,8-醌(6)的环加成,通过光化学法制备6,11-二羟基衍生物。氯化合物很容易被二胺取代,从而提供相应的1-氨基取代的羟基四环醌。
Construction of Multi-Substituted Benzenes via NHC-Catalyzed Reactions of Carboxylic Esters
作者:Jichang Wu、Chengli Mou、Yonggui Robin Chi
DOI:10.1002/cjoc.201700773
日期:2018.4
A carbene‐catalyzed ester activation reaction for the synthesis of multi‐substituted benzenes is developed. Tetra‐substituted benzene compounds are efficiently synthesized through this methodology. Compared with aldehyde substrates used in previous reports, the ester substrates used here are much more readily available and inexpensive. In addition, the TEMPO oxidant used here is more inexpensive than
Carbene-catalyzed enal γ-carbon addition to α-ketophosphonates for enantioselective access to bioactive 2-pyranylphosphonates
作者:Jun Sun、Fangcheng He、Zhongyao Wang、Dingwu Pan、Pengcheng Zheng、Chengli Mou、Zhichao Jin、Yonggui Robin Chi
DOI:10.1039/c8cc03017k
日期:——
A carbene-catalyzed enantioselective [4+2] cycloaddition reaction between α,β-unsaturated aldehydes and α-ketophosphonates is developed. The reaction affords chiral 2-pyranylphosphonates with excellent enantioselectivities. The optically enriched phosphonate products bear multiple functional groups, including unsaturated lactone and phosphonate moieties that often lead to unique bio-activities. Preliminary
An asymmetric hydrogenation of sterically hindered β,β-disubstituted enones has been well-established by using a ruthenium complex composed of an achiral diphosphane and a chiral diamine as catalyst, wherein the carbonyl group was selectively hydrogenated to give a wide range of chiral allylic alcohols with high levels of enantioselectivity and complete chemoselectivity.
Cobalt-Catalyzed Diastereo- and Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective
Carbene-Catalyzed Formal [3+3] Cycloaddition Reaction for Access to Substituted 2-Phenylbenzothiazoles
作者:Zhibin Ni、Chengli Mou、Xun Zhu、Puying Qi、Song Yang、Yonggui Robin Chi、Zhichao Jin
DOI:10.1002/ejoc.201901773
日期:2020.1.31
carbene‐catalyzed oxidative cycloadditionreaction is developed for efficient access to multi‐functionalized 2‐phenylbenzothiazoles. A broad scope of heavily substituted arenes bearing 2‐benzothiazole groups have been prepared in good to excellent yields. The remote C(sp2)–H bond in the substituted arene products can be regioselectively activated by Pd catalysts with the direction of the 2‐benzothiazole groups