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. 2018 Jun 19;8(40):22447-22451.
doi: 10.1039/c8ra03067g.

Efficient access to amides of the carborane carboxylic acid [1-(COOH)-CB11H11]

Yunjun Shen  1 , Kai Zheng  1 , Rakesh Dontha  1 , Yani Pan  1 , Jiyong Liu  1 , Simon Duttwyler  1
Affiliations

Efficient access to amides of the carborane carboxylic acid [1-(COOH)-CB11H11]

Yunjun Shen et al. RSC Adv. .

Abstract

The preparation of the carborane acid chloride [1-(COCl)-CB11H11]- from the carboxylic acid [1-(COOH)-CB11H11]- is reported. This acid chloride exhibits remarkable inertness towards moisture and can be stored under ambient conditions for several months. Reaction with amines affords secondary and tertiary carborane amides [1-(CONR1R2)-CB11H11]- in moderate to high yields under mild conditions. Two of the amide products were characterized by X-ray crystallography in addition to spectroscopic analysis. Preliminary studies show that the amides can be reduced to the corresponding amines and that the acid chloride has the potential to serve as a starting material for carborane ester formation.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. General structure of icosahedral carboranes (a), reported carborane esters and carboxamides (b–d) and outline of the present study (e).
Scheme 1
Scheme 1. Preparation of carboxylic acid chloride 1 and subsequent synthesis of carborane amides 2. Yields are isolated yields with respect to 1.
Fig. 2
Fig. 2. 11B{1H} NMR spectra of [Et4N][1-(COOH)–CB11H11] (a), [Et4N][1] (b) and [Et4N][2a] (c) (acetone-d6, 22 °C, 160 MHz for 11B).
Scheme 2
Scheme 2. Synthesis of carborane amides 4 starting from halogenated carborane precursors. Yields are isolated yields with respect to 3.
Fig. 3
Fig. 3. Packing of 2e in crystals of the composition Na[Et4N][2e]2; H atoms omitted for clarity; 30% displacement ellipsoids.
Fig. 4
Fig. 4. X-ray crystal structures of 2e (a) and 2m (b). Cations and H atoms except for N–H omitted for clarity; 30% displacement ellipsoids.
Scheme 3
Scheme 3. Ester formation starting from 1 (a) and reduction of amides 2i and 2j (b).
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