Cross-conjugated trienamines are introduced as a new concept in asymmetric organocatalysis. These intermediates are applied in highly enantioselective Diels-Alder and addition reactions, providing functionalized bicyclo[2.2.2]octane compounds and gamma'-addition products, respectively. The nature of the transformations and the intermediates involved are investigated by computational calculations and NMR analysis.
Spirooxindoles as novel 3D-fragment scaffolds: Synthesis and screening against CYP121 from M. tuberculosis
作者:Holly J. Davis、Madeline E. Kavanagh、Tudor Balan、Chris Abell、Anthony G. Coyne
DOI:10.1016/j.bmcl.2016.05.073
日期:2016.8
and fragmentlibraries is an active area of research. The development of novel strategies to synthesise compounds with 3D character in order to expand the diversity of a fragmentlibrary was explored. A range of substituted bicyclo[2,2,1]spirooxindoles were synthesised using a Diels–Alder [4+2] cycloaddition reaction. Both diastereoisomers were isolated from the reactions and these 3D fragment scaffolds
Catalytic Enantioselective Carboannulation with Allylsilanes
作者:Nicolas R. Ball-Jones、Joseph J. Badillo、Ngon T. Tran、Annaliese K. Franz
DOI:10.1002/anie.201403607
日期:2014.9.1
scandium(III)/indapybox complex with tetrakis‐[3,5‐bis(trifluoromethyl)phenyl]‐borate (BArF) to enhance catalytic activity and control stereoselectivity. Functionalized cyclopentanes containing a quaternary carbon center are derived from alkylidene oxindole, coumarin, and malonate substrates with high stereoselectivity. The enantioselective 1,4‐conjugate addition and enantioselective lactone formation
When Ethyl Isocyanoacetate Meets Isatins: A 1,3-Dipolar/Inverse 1,3-Dipolar/Olefination Reaction for Access to 3-Ylideneoxindoles
作者:Wen-Kui Yuan、Tao Cui、Wei Liu、Li-Rong Wen、Ming Li
DOI:10.1021/acs.orglett.8b00217
日期:2018.3.16
A new CuI/1,10-phen-catalyzed reaction for the synthesis of 3-ylideneoxindoles from readily available isatins and ethyl isocyanoacetate, in which ethyl isocyanoacetate acts as a latent two-carbon donor like the Wittig reagent, is reported. A tandem procedure including 1,3-dipolar cycloaddition/inverse 1,3-dipolar ring opening/olefination allows the preparation of 3-ylideneoxindoles with broad functional
Enantioselective Synthesis of Indole-Fused Dihydropyranones via Catalytic Cycloaddition of Ketenes and 3-Alkylenyloxindoles
作者:Hui Lv、Xiang-Yu Chen、Li-hui Sun、Song Ye
DOI:10.1021/jo101318u
日期:2010.10.15
Chiral N-heterocyclic carbenes were found to be efficient catalysts for the formal [4+2] cycloaddition reaction of alkyl(aryl)ketenes and 3-alkylenyloxindoles to give the corresponding 3,4-dihydropyrano[2,3-b]indol-2-ones in excellent yields with good diastereo- and enantioselectivities.
发现手性N-杂环卡宾是有效的催化剂,用于烷基(芳基)乙烯酮和3-亚烷基氧吲哚的正式[4 + 2]环加成反应,得到相应的3,4-二氢吡喃并[2,3 - b ]吲哚-2 -具有优异的非对映选择性和对映选择性的高收率化合物。
An efficient one pot regioselective synthesis of a 3,3′-spiro-phosphonylpyrazole-oxindole framework via base mediated [1,3]-dipolar cycloaddition reaction of the Bestmann–Ohira reagent with methyleneindolinones
作者:Anil M. Shelke、Gurunath Suryavanshi
DOI:10.1039/c5ob01020a
日期:——
regioselective synthesis of racemic 3,3′-spiro-phosphonylpyrazole-oxindole by 1,3-dipolar cycloaddition of an in situ generated anion of dialkyl 1-diazomethylphosphonate from the Bestmann–Ohira reagent (BOR) & methyleneindolinones has been developed. The synthesis affords the highly functionalized pyrazole scaffolds in good yields with excellent regioselectivity under mild reaction conditions within