Carbohydrates as efficient catalysts for the hydration of α-amino nitriles
作者:Sampada Chitale、Joshua S. Derasp、Bashir Hussain、Kashif Tanveer、André M. Beauchemin
DOI:10.1039/c6cc07530d
日期:——
Directed hydration of alpha-amino nitriles was achieved under mild conditions using simple carbohydrates as catalysts exploiting temporary intramolecularity. A broadly applicable procedure using both formaldehyde and NaOH as catalysts efficiently hydrated a variety of primary and secondary susbtrates, and allowed the hydration of enantiopure substrates to proceed without racemization. This work also
Herein, we disclose a transition-metal-free reaction system that enables α-cyanation of sulfonamides through C–H bond cleavage for the preparation of α-amino nitriles, including difficult-to-access all-alkyl α-tertiary scaffolds. More than 50 substrate examples prove a wide functional group tolerance. Additionally, its synthetic practicality is highlighted by gram-scalability and the late-stage modification
Studies on Phosphoroheterocycle Chemistry II: A Simple and New Route to 1, 3, 2-Diazaphospholidine-4-thione 2-sulfide Derivatives
作者:ShengLou Deng、DongZhi Liu
DOI:10.1055/s-2001-18708
日期:——
A simple and new method for the synthesis of phosphoroheterocycles 1,3,2-diazaphospholidine-4-thione 2-sulfide derivatives by treatment of Lawesson’s reagent (LR) with a variety of α-aminonitriles has been developed. The same methodology was also used in the preparation of fused phosphoroheterocycle 6 from 5-amino-4-cyano-3-methylthia-1-phenylpyrazole. The possible mechanism of the reaction involving addition of P-SH to the nitrile and subsequent rearrangement is proposed.
Hydrolysis of various nitrile compounds to the amides by catalysis of 2-mercaptoethanol in a phosphate buffer
作者:Young Bok Lee、Yang Mo Goo、Youn Young Lee、Jae Keun Lee
DOI:10.1016/s0040-4039(00)70718-0
日期:——
α-Aminonitriles, 4-nitrobenzonitrile and 3,5-dinitrobenzonitrile were hydrolyzed exclusively to amides efficiently when they were stirred with 2-mercaptoethanol in a phosphate buffer (pH 7.0), 50 mM).