Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (12): 2738.doi: 10.7503/cjcu20130303

• Organic Chemistry • Previous Articles     Next Articles

Chemoselective Synthesis of 1,1-Diacetate from Aldehydes Catalyzed by Sulfonated Carbon Nanocage

ZHENG Yan-Jun, LI Jiang, LU Jun-Jin, JIA Yu-Cai, LI Bao-Lin   

  1. Key Laboratory for Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China
  • Received:2013-04-02 Online:2013-12-10 Published:2013-07-02

Abstract:

Acetals are one of the most useful carbonyl protecting groups because of their stability under both neutral and basic media. In addition, acetals can be converted to a variety of other functional groups. Thus, to find a green synthesis method of acetals, the sulfonated carbon nanocage(S-CKT) as a reusable solid acid catalyst was applied to the reaction of aldehydes with acetic anhydride. As a result, a mild and efficient method was developed for the chemoselective preparation of 1,1-diacetates(acylals) from the mixture of aldehydes(2 mmol) and acetic anhydride(5 mmol) catalyzed by S-CKT(30 mg) under room temperature and solvent-free conditions. The reaction takes a shorter time(5—12 min) and gives good to excellent yield(89%—98%). While it is found that ketone doesn't react with acetic anhydride to yield corresponding product under the same conditions. The catalyst was recycled seven times without a distinct loss of activity by simple filtration and washing.

Key words: 1,1-Diacetate, Aldehyde protection, Heterogeneous catalyst, Sulfonated carbon nanocage

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