Brönsted Acid-Catalyzed One-Pot Synthesis of Indoles from <i>o</i>-Aminobenzyl Alcohols and Furans
作者:Alexey Kuznetsov、Anton Makarov、Aleksandr E. Rubtsov、Alexander V. Butin、Vladimir Gevorgyan
DOI:10.1021/jo402132p
日期:2013.12.6
Brönstedacid-catalyzed one-pot synthesis of indoles from o-aminobenzyl alcohols and furans has been developed. This method operates via the in situ formation of aminobenzylfuran, followed by its recyclization into the indole core. The method proved to be efficient for substrates possessing different functional groups, including −OMe, −CO2Cy, and −Br. The resulting indoles can easily be transformed
Asymmetric domino aza-Michael–Michael reaction of o-N-protected aminophenyl α,β-unsaturated ketones: construction of chiral functionalized tetrahydroquinolines
作者:Shinae Kim、Ki-Tae Kang、Sung-Gon Kim
DOI:10.1016/j.tet.2014.05.114
日期:2014.8
The diastereo- and enantioselective synthesis of 2,3,4-trisubstitutedtetrahydroquinolines has been developed through organocatalytic domino aza-Michael–Michaelreaction of o-N-tosylaminophenyl α,β-unsaturated ketones with nitroalkenes. This useful and simple domino process afforded diverse highly functionalized tetrahydroquinolines, some of which are not easily accessible using other methodologies
One-Pot Catalytic Enantioselective Synthesis of Functionalized Tetrahydroquinolines by Aza-Michael/Michael Cascade Reactions of N-Protected 2-Aminophenyl α,β-Unsaturated Esters with Nitroolefins
作者:Sung-Gon Kim、Ki-Tae Kang
DOI:10.1055/s-0034-1379044
日期:——
synthesis of functionalized tetrahydroquinolines with useful biological properties has been developed by means of asymmetric organocatalytic aza-Michael/Michael cascadereactions of nitroolefins with N-protected 2-aminophenyl α,β-unsaturated esters in the presence of a chiral thiourea catalyst. The reaction gave the corresponding highly functionalized tetrahydroquinolines in good yields, excellent
enantioselective Pd(II)-catalyzed intramolecularoxidative amination reaction was developed utilizing the commercially available chiral X-type ligand (1S)-(+)-camphorsulfonic acid. The Wacker-type cyclization produced chiral indoline products with enantioselectivies up to 45% ee. Electronic structure calculations employing density functional theory support a trans-aminopalladation mechanism.
The Synthesis of 5-Amino-dihydrobenzo[<i>b</i>]oxepines and 5-Amino-dihydrobenzo[<i>b</i>]azepines via Ichikawa Rearrangement and Ring-Closing Metathesis
The combination of Ichikawa’s rearrangement and a ring-closing metathesis reaction of allyl carbamates is presented as a method for the preparation of 5-amino-substituted 2,5-dihydro-benzo[b]oxepines, 2,5-dihydro-benzo[b]azepines, and 2,5-dihydro-benzo[b]thiepins. It was demonstrated that the use of nonracemic allyl carbamates enables the synthesis of enantioenriched benzo-fused seven-membered heterocycles
市川的重排和烯丙基氨基甲酸酯的闭环复分解反应的组合是作为用于制备5-氨基-取代的2,5-二氢-苯并[方法b ] oxepines,2,5-二氢-苯并[ b ] zepines和2,5-二氢-苯并[ b ]噻吩类。已经证明,使用非外消旋的烯丙基氨基甲酸酯能够合成对映体富集的苯并稠合的七元杂环。最后,显示了所获得结构的进一步功能化允许获得具有药理活性的5-氨基取代的2,3,4,5-四氢-1-苯并[ b ]奥沙平支架。