Catalytic, asymmetric synthesis of α-acetoxy amides
摘要:
Non-racemic cyanohydrin acetates are readily available from aldehydes and potassium cyanide/acetic anhydride by use of bimetallic titanium (salen) catalyst 1. Treatment of the cyanohydrin acetates with a platinum(II) phosphinito catalyst 3 under neutral conditions results in chemoselective hydrolysis to the corresponding alpha-acetoxy amides in a racemization free process. (C) 2004 Elsevier Ltd. All rights reserved.
A Convenient and Improved Method for the Preparation of Cyanohydrin Esters from Acyl Cyanides and Aldehydes
作者:Mitsuhiro Okimoto、Toshiro Chiba
DOI:10.1055/s-1996-4361
日期:1996.10
Various kinds of cyanohydrin esters can be obtained in good to excellent yields from aldehydes by treatment with acyl cyanides in a heterogeneous mixture of aqueous potassium carbonate and acetonitrile.
通过在水性碳酸钾和乙腈的异相混合物中用酰基氰化物处理醛,可以获得多种氰醇酯,收率良好至优异。
TBD- or PS-TBD-Catalyzed One-Pot Synthesis of Cyanohydrin Carbonates and Cyanohydrin Acetates from Carbonyl Compounds
作者:Satoru Matsukawa、Junya Kimura、Miki Yoshioka
DOI:10.3390/molecules21081030
日期:——
Cyanation reactions of carbonylcompounds with methyl cyanoformate or acetyl cyanide catalyzed by 5 mol % of 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) were examined. Using methyl cyanoformate, the corresponding cyanohydrin carbonates were readily obtained in high yield for aromatic and aliphatic aldehydes and ketones. Similar results were obtained when acetyl cyanide was used as the cyanide source.
The Chemistry of Acylals. 3. Cyanohydrin Esters from Acylals with Cyanide Reagents
作者:Marcel Sandberg、Leiv K. Sydnes
DOI:10.1021/ol005535b
日期:2000.3.1
[reaction: see text] When treated with KCN in DMSO at room temperature, acylals from aliphatic aldehydes gave the corresponding cyanohydrin esters in good to excellent yields. Acylals from aromatic aldehydes were less reactive and gave several byproducts in addition to fair yields of cyanohydrin under the same conditions. Trimethylsilyl cyanide mixed with titanium(IV) chloride afforded cyanohydrin
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
Processes for producing alpha-cyanohydrin esters and alpha-hydroxy acids
申请人:Daicel Chemical Industries, Ltd.
公开号:EP0926134A2
公开(公告)日:1999-06-30
The present invention relates to a process for the preparation of compounds of formula (4) wherein a carbonyl compound of the formula (3) is reacted in the presence of a cyanogenation agent with an enol ester of the formula (1) or with an oxime ester of the formula (2):
wherein R1 through R8 have meanings given in the application.
The compound of formula (4) can be hydrolysed to obtain the corresponding compound of formula (5):