Abstract
In the past decade, it has been extensively demonstrated that multicomponent chemistry is an ideal tool to create molecular complexity. Furthermore, combination of these complexity-generating reactions with follow-up cyclization reactions led to scaffold diversity, which is one of the most important features of diversity oriented synthesis. Scaffold diversity has also been created by the development of novel multicomponent strategies. Four different approaches will be discussed [single reactant replacement, modular reaction sequences, condition based divergence, and union of multicomponent reactions (MCRs)], which all led to the development of new MCRs and higher order MCRs, thereby addressing both molecular diversity and complexity.
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Notes
- 1.
Small molecules are typically compounds with a molecular weight less than 500 Da: [1].
- 2.
Molecules/interactions that are considered to be “undruggable”, comprise transcription factors, regulatory RNAs, interactions between proteins (especially intracellular) and between proteins and DNA. There are only about 500 “druggable” targets: [4].
- 3.
The chemical space is a multidimensional area with each dimension defined by a descriptor which can be molecular weight, polarity, solubility, membrane permeability, binding constant. H-bonding properties etc. and encompasses all small carbon-based molecules that could in principle be created: [5].
- 4.
The E factor is defined as the mass ratio of waste (everything but the desired product) to desired product. For a recent overview, see: [19].
- 5.
Although the authors used a pre-formed imine, there are several examples known of proline catalyzed one-pot three component Mannich reactions. However, if aromatic aldehydes are used in this one-pot procedure, the obtained Mannich products had to be reduced (by NaBH4) to the corresponding alcohols to avoid epimerization: [38, 39].
- 6.
This figure is a slightly modified figure as published in [40].
- 7.
- 8.
- 9.
- 10.
The use of phosphonates with large R1 substituents resulted in a significant decrease in yield, 22–39% for R1 = Ph and i-pentyl.
- 11.
Several other research groups have been involved in MCRs with aminoazoles, 1,3-diketones and aldehydes. For a recent overview see: [93].
- 12.
Propagation of ultra sound waves into the liquid medium results in a series of high-pressure (compression) and low-pressure (rarefaction) cycles, with rates depending on the frequency. During the low-pressure cycle, high-intensity ultrasonic waves generate small vacuum bubbles in the liquid, which can reach a volume at which they are not stable anymore resulting in a violent collapse. This phenomenon is termed cavitation: [94, 95].
- 13.
It has to be noted that the formation of oxazoles using isocyano amides has been well studied by Zhu and co-workers (see [58, 59]). With the work of Elders et al. the oxazole MCR has been expanded with a wide range of isocyano esters. The MCR with isocyano amides can now also be directed to the 2-imidazolines.
- 14.
- 15.
The α-isocyanide is α-acidic and will react in the 3CR to yield 2H-2-imidazolines, while the other isocyanide is an aliphatic isocyanide and remains unaffected.
Abbreviations
- Ac:
-
Acetyl
- Ar:
-
Aryl
- BINAP:
-
2,2′-bis(diphenylphosphino)-1,1′-binaphthyl
- Bn:
-
Benzyl
- Bu:
-
Butyl
- tBu:
-
Tert-butyl
- CBD:
-
Condition-based divergence
- Cp:
-
Cyclopentadienyl
- CR:
-
Component reaction
- 3D:
-
Three dimensional
- DA:
-
Diels-Alder
- DCM:
-
Dichloromethane
- de :
-
Diastereomer excess
- DIPEA:
-
N,N-diisopropylethylamine
- DMAD:
-
Dimethyl acetylenedicarboxylate
- DMF:
-
Dimethylformamide
- DMSO:
-
Dimethyl sulfoxide
- DOS:
-
Diversity oriented synthesis
- dppf:
-
1,1′-bis(diphenylphosphino)ferrocene
- dr :
-
Diastereomer ratio
- ee :
-
Enantiomer excess
- Et:
-
Ethyl
- EWG:
-
Electron withdrawing group
- FG:
-
Functional group
- HWE:
-
Horner-Wadsworth-Emmons
- IMCR:
-
Isocyanide based multicomponent reaction
- mCPBA:
-
m-chloroperoxybenzoic acid
- MCR:
-
Multicomponent reaction
- Me:
-
Methyl
- MeCN:
-
Acetonitrile
- min.:
-
Minute(s)
- MRS:
-
Modular reaction sequences
- MS:
-
Molecular sieves
- MTBE:
-
Methyl tert-butyl ether
- MW:
-
Microwave
- n.d.:
-
Not determined
- Nu:
-
Nucleophile
- P-3CR:
-
Passerini 3-component reaction
- Ph:
-
Phenyl
- PMP:
-
p-methoxyphenyl
- rt:
-
Room temperature
- SRR:
-
Single reactant replacement
- Tf:
-
Trifluoromethanesulfonyl (triflyl)
- TFA:
-
Trifluoroacetic acid
- THF:
-
Tetrahydrofuran
- TMS:
-
Trimethylsilyl
- Ts:
-
Tosyl, 4-toluenesulfonyl
- U-4CR:
-
Ugi 4-component reaction
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Acknowledgment
This work was performed with financial support of the Dutch Science Foundation (NWO, VICI grant).
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Scheffelaar, R., Ruijter, E., Orru, R.V.A. (2010). Multicomponent Reaction Design Strategies: Towards Scaffold and Stereochemical Diversity. In: Orru, R., Ruijter, E. (eds) Synthesis of Heterocycles via Multicomponent Reactions II. Topics in Heterocyclic Chemistry, vol 25. Springer, Berlin, Heidelberg. https://doi.org/10.1007/7081_2010_44
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