Categories: C-C Bond Formation > Arenes, Cyclic Compounds > Benzocycloalkenones
Synthesis of indanones
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Cyclization of electron-rich 2-alkyl-1-ethynylbenzene derivatives was catalyzed
by TpRuPPh3(CH3CN)2PF6 in hot
toluene to form 1-substituted-1H-indene and 1-indanone products. The
cyclization mechanism involves a 1,5-hydrogen shift of an initial
metal-vinylidene intermediate.
A. Odedra, S. Datta, R.-S. Liu, J. Org. Chem., 2007,
72, 3289-3292.
Indanones and 2-cyclopentenones have been successfully prepared in good to
excellent yields by the palladium-catalyzed carbonylative cyclization of
unsaturated aryl iodides and dienyl triflates, iodides, and bromides,
respectively. The mechanism is discussed.
S. V. Gagnier, R. C. Larock, J. Am. Chem. Soc., 2003,
125, 4804-4807.
A nickel-catalyzed reductive cyclization of broad range of enones affords
indanones in high enantiomeric induction. The versatility of this method is
demonstrated in several short stereoselective syntheses of medically valuable (R)-tolterodine,
(+)-indatraline, and (+)-multisianthol.
X. Qin, M. W. Y. Lee, J. S. Zhou,
Org. Lett., 2019, 21, 5990-5994.
Enantioselective synthesis of chiral 3-aryl-1-indanones was achieved through a
rhodium-catalyzed asymmetric intramolecular 1,4-addition of pinacolborane
chalcone derivatives in the presence of MonoPhos as chiral ligand under
relatively mild conditions. This reaction offers an easy access to various
enantioenriched 3-aryl-1-indanone derivatives in high yields with excellent
enantioselectivities.
Y.-N. Yu, M.-H. Xu, J. Org. Chem., 2013,
78, 2736-2741.
A catalytic amount of SbF5 efficiently converted a mixture of
phenylalkynes and aldehydes to indanone compounds in one pot in the presence of
EtOH as an additive, and the reaction afforded the corresponding
2,3-disubstituted indanones as a single trans-isomer.
A. Saito, M. Umakoshi, N. Yagyu, Y. Hanzawa, Org. Lett., 2008,
10, 1783-1785.
The combination of In(OTf)3 and benzoic acid synergistically promotes
the coupling of alkynes and acetals to form 2,3-disubstituted indanones in
excellent yield and diastereoselectivity via a tandem [2 + 2] cycloaddition and
Nazarov reaction.
L. Zhu, Z.-G. Xi, J. Lv, S. Luo, Org. Lett., 2013,
15, 4496-4499.
A rhodium-catalyzed tandem carborhodium/cyclization and
intramolecular proton shift pathway enables the synthesis of 2,3-substituted
indanones in very good yields under very mild and sustainable
conditions using water as the sole solvent without exogenous ligands. The reaction is compatible with a broad
range of functional internal alkynes.
A. Zhu, Y. Sun, J. Lai, Z. Chen, X. Bu, Y.-N. Yue, M. Ma, F. Xue, J. Org. Chem., 2022, 87,
7884-7894.
A Ni-catalyzed formal exo-selective carboacylation of o-allylbenzamides
with arylboronic acid pinacol esters provides 2-benzyl-2,3-dihydro-1H-inden-1-ones
in good yields. The reaction is triggered by oxidative addition of an activated
amide C-N bond to a Ni(0) catalyst and proceeds via alkene insertion into a
Ni(II)-acyl bond.
J. A. Walker Jr., K. L. Vickerman, J. N. Humke, L. M. Stanley, J. Am. Chem. Soc., 2017,
139, 10228-10231.
An iridium-catalyzed alkylation of ketones with alcohols enables a one-step
access to cyclic and linear ketones in high yields. A
scale-up experiment for the synthesis of donepezil shows the excellent practicability of this protocol.
S. Wang, R. Miao, Y. Xia, Y. Wei, R. Luo, L. Ouyang, Synthesis, 2022, 54,
5253-5260.
The use of 2-(4,5-dihydroimidazol-2-yl)pyrimidine as ligand enables a
Pd-catalyzed reaction of α,β-unsaturated esters with arylboronic acids to
provide a wide range of 3,3-disubstituted indan-1-ones bearing a quaternary
carbon in high yields. The reaction involves a
tandem conjugate addition/1,4-Pd shift followed by a cyclization.
A. Gao, Y.-Y. Liu, H. Li, C.-H. Ding, X.-L. Hou, J. Org. Chem.,
2017, 82, 9988-9994.
Enantioenriched CN-containing all-carbon quaternary stereocenters can be
assembled by desymmetrizing cyclization of aryl/alkenyl halide-tethered
malononitriles. The use of a silane reductant is crucial to the
enantioselectivity and reactivity.
Z.-H. Chen, R.-Z. Sun, F. Yao, X.-D. Hu, L.-X. Xiang, H. Cong, W.-B. Liu, J. Am. Chem. Soc.,
2022, 144, 4776-4782.
A palladium-catalyzed asymmetric C-C bond activation/carbonylation of
cyclobutanones with CO provides chiral indanones bearing a quaternary carbon
stereocenter in good yields with an excellent enantiomeric ratio and good
functional group tolerance. Transformations of the products to chiral
3,4-dihydroquinolin-2(1H)-ones and 1H-indenes are also reported.
L. Chen, C. Shi, W. Li, B. Li, J. Zhu, A. Lin, H. Yao, Org. Lett., 2022, 24,
9157-9162.
A palladium-catalyzed asymmetric C-C bond activation/carbonylation of
cyclobutanones with CO provides chiral indanones bearing a quaternary carbon
stereocenter in good yields with an excellent enantiomeric ratio and good
functional group tolerance. Transformations of the products to chiral
3,4-dihydroquinolin-2(1H)-ones and 1H-indenes are also reported.
L. Chen, C. Shi, W. Li, B. Li, J. Zhu, A. Lin, H. Yao, Org. Lett., 2022, 24,
9157-9162.
A Rh(III)-catalyzed reaction of α-carbonyl sulfoxonium ylides with activated
alkenes furnishes a variety of substituted indanone derivatives via a formal [4
+ 1] cycloaddition. The reaction tolerates a broad range of functional groups.
Y. Kommagalla, S. Ando, N. Chatani,
Org. Lett., 2020, 22, 1375-1379.
α-Ammonium acetophenones with an oxidizing C-N bond can serve as substrates for
Rh(III)-catalyzed C-H activation under redox-neutral conditions. The coupling
with α-diazo esters afforded benzocyclopentanones, and the coupling with
unactivated alkenes such as styrenes and aliphatic olefins gave ortho-olefinated
acetophenoes. In both systems the reactions proceeded with a broad scope, high
efficiency, and functional group tolerance.
S. Yu, S. Liu, Y. Lan, B. Wan, X. Li, J. Am. Chem. Soc., 2015,
137, 1623-1631.
A facile and highly efficient copper-catalyzed intramolecular annulation of
simple 2-ethynylbenzaldehyde derivatives provides 3-hydroxy-1-indanones under
mild conditions in very good yields.
G. He, C. Wu, J. Zhou, Q. Yang, C. Zhang, Y. Zhou, H. Zhang, H. Liu, J. Org. Chem., 2018, 83,
13356-13362.
A highly enantioselective carboalkoxylation of alkynes catalyzed by cationic (DTBM-MeO-Biphep)gold(I)
complexes enables the synthesis of various optically active β-alkoxyindanone and
3-methoxycyclopentenones derivatives in good yields with high
enantioselectivities. The reaction proceeds through an enantioselective
cyclization of intermediates containing vinylgold(I) and prochiral oxocarbenium
moieties.
W. Zi, F. D. Toste, J. Am. Chem. Soc., 2013,
135, 12600-12601.
A migratory insertion of carbene followed by a Heck reaction enables the
synthesis of 2-arylidene-3-aryl-1-indanones in excellent yields from very stable
and easily accessible N-tosylhydrazones and 2′-iodochalcones through 5-exo-trig
cyclization that delivers the products selectively with E configuration
of the double bond. In situ synthesis of both 2′-iodochalcones and N-tosylhydrazones
has also been demonstrated.
D. Arunprasath, P. Muthupandi, G. Sekar, Org. Lett.,
2015,
17, 5448-5451.
A new palladium(0)-catalyzed three-component reaction of salicylic aldehyde
triflates, ethylene glycol vinyl ether, and various secondary nucleophilic
amines involving an initial internal Heck arylation, iminium ion formation, and
subsequent tandem cyclization gives tertiary 3-aminoindan acetals.
A. Arefalk, M. Larhed, A. Hallberg, J. Org. Chem., 2005, 70,
938-942.
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S. Wang, L. Tang, B. Cai, Z. Yin, Y. Li, L. Xiong, X. Kang, J. Xuan, Y. Pei,
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A chiral (1S,2S)-cyclohexanediamine backbone salen-zirconium(IV)
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