Several naturallyoccurring cyanohydrins were tested for fumigation toxicity to two insect species, the house fly (Musca domestica L) and the lesser grain borer (Rhyzopertha dominica (F)). Synthetic analogues of these compounds were tested as well. Most of the cyanohydrins tested were more toxic as fumigants to M domestica and R dominica than chloropicrin; some compounds were nearly as toxic as dichlorvos
A single-step, mild, neutral, catalyst-free method for cyanohydrin synthesis
作者:Mariam S. Degani、Manoj D. Kakwani、Nutan H. Palsule Desai、Ranjeet Bairwa
DOI:10.1007/s00706-011-0613-4
日期:2012.3
carbonyl compounds can be transformed to their corresponding cyanohydrins in a single step using a dimethyl sulfoxide (DMSO)–water system in excellent yields (75–94%). The major advantages of this system are that the reaction conditions are mild and neutral; the reaction proceeds without catalyst and gives the corresponding cyanohydrins in short time (15–120 min). Graphical Abstract
Studies on Phosphoroheterocycle Chemistry III: An Unusual Way to 1,3,2-Thiazaphospholidine-4-thione 2-Sulfide Derivatives
作者:ShengLou Deng、RuYu Chen
DOI:10.1055/s-2002-35619
日期:——
An unusual but efficient method for the synthesis of phosphoroheterocycles, 1,3,2-thiazaphospholidine-4-thione 2-sulfide derivatives, by the reaction of Lawesson'sreagent with a variety of u-hydroxy nitriles has been developed. The possible mechanism of the reaction is proposed to involve thiation of hydroxy group in a first step, sequential addition of P-SH to the nitrile and rearrangement resulting
The simplest synthesis of 5,5-disubstituted and spiranic methyl 4-amino-2,2-dioxo-2,5-dihydro-1,2λ6-oxathiole-3-carboxylates
作者:Alexey V. Dobrydnev、Bohdan V. Vashchenko、Yulian M. Volovenko
DOI:10.1016/j.tetlet.2018.03.029
日期:2018.4
We report the short and the simplest strategy for the synthesis of methyl 4-amino-2,2-dioxo-2,5-dihydro-1,2λ6-oxathiole-3-carboxylates bearing aliphatic substituents at the 5th position. A number of cyanohydrins were forced to react with methyl 2-(chlorosulfonyl)acetate to give the interim methyl 2-[(cyanomethoxy)sulfonyl]acetates that upon Et3N-mediated conditions underwent the CSIC [Carbanion mediated
A new (R)-hydroxynitrile lyase from Prunus mume: asymmetric synthesis of cyanohydrins
作者:Samik Nanda、Yasuo Kato、Yasuhisa Asano
DOI:10.1016/j.tet.2005.08.105
日期:2005.11
A new hydroxynitrile lyase (HNL) was isolated from the seed of Japanese apricot (Prunus mume). The enzyme has similar properties with HNL isolated from other Prunus species and is FAD containing enzyme. It accepts a large number of unnatural substrates (benzaldehyde and its variant) for the addition of HCN to produce the corresponding cyanohydrins in excellent optical and chemical yields. A new HPLC