1,2-Diphenylethylenediamine linked chiral Ti(iv) complex—a new entry to the highly enantioselective silylcyanation of aliphatic and aromatic aldehydesElectronic supplementary information (ESI) available: experimental section. See http://www.rsc.org/suppdata/cc/b1/b107867d/
作者:Chun-Wei Chang、Chun- TzuYang、Chyuan-Der Hwang、Biing-Jiun Uang
DOI:10.1039/b107867d
日期:2002.1.14
Highly enantioselective silylcyanation of aliphatic and aromatic aldehydes was achieved by using a 1,2-diphenylethylenediamine linked chiral Ti(IV) complex as the catalyst.
A dynamic resolution process based on multiple reversible cyanohydrin formation coupled to lipase-mediated transesterification is demonstrated. The resulting process resulted in the efficient evaluation of complex lipase performances in asymmetric cyanohydrinacylatesynthesis. Dynamic systems were generated and resolved in situ, and the effects of the reaction conditions could be directly monitored
N-heterocyclic carbene catalyzed cyanation reaction of carbonyl compounds with ethyl cyanoformate and acetyl cyanide
作者:Jie Zhang、GuangFen Du、YueKe Xu、Lin He、Bin Dai
DOI:10.1016/j.tetlet.2011.10.119
日期:2011.12
employed as an efficientcatalyst for cyanation reaction of carbonyl compounds. Under catalysis of 1 mol % NHCs, various aldehydes and 2,2,2-trifluoroacetophenone coupled with ethyl cyanoformate in THF to provide cyanohydrins ethyl carbonates in excellent yields. While in the presence of 10 mol % catalyst, different types of aldehydes and 2,2,2-trifluoroacetophenone reacted with acetyl cyanide in dichloroethane
A practical palladium-catalyzed ortho-olefination of O-acetyl cyanohydrins assisted by synergetic directing groups has been developed. Thus, a range of olefinated O-acetyl cyanohydrins were synthesized in moderate to good yields. The reaction occurs efficiently with high regioselectivity and with a satisfactory tolerance of functional groups.
A variety of cyanohydrin esters were readily prepared from carbonyl compounds with trimethylsilyl cyanide and acid anhydride under the influence of a catalytic amount of iron(III) chloride in a convenient one-pot procedure. (c) 2005 Elsevier Ltd. All rights reserved.