Novel Chlorination Reagent and a Novel Process for Chlorination of Sugars Using Thionyl Chloride
申请人:Ratnam Rakesh
公开号:US20100228020A1
公开(公告)日:2010-09-09
Preparation of chlorinating reagent or chlorination reaction itself for use in a reaction such as production of high intensity sweetener trichlorogalactosucrose (TGS) from partially protected sucrose, comprising reaction of dimethylformamide (DMF) with thionyl chloride or another sulphur containing inorganic acid chlorides including sulphuryl chloride is faced with a problem of prolific release of gaseous by-products, that at times may lead to violent explosion also. This problem is solved by innovative addition of solid powder inert to the constituents of the chlorination reaction mixture to the reaction, or by adding DMF to acid chloride solution in that order. The invention also leads to use of isolated solid Vilsmeier reagent being used for chlorination in a solvent other than DMF making it possible to avoid altogether problems arising from use of DMF which include irrecoverable loss in alkaline as well as acid conditions, interference in crystallization of TGS and the like.
Novel chlorination process for preparing sucralose
申请人:Xu Shaojun
公开号:US20080300392A1
公开(公告)日:2008-12-04
A process for preparing a sucralose-6-ester, a key intermediate to sucralose. The process contains (a) creating a heterogeneous mixture comprising a first phase comprising a sucrose-6-ester and a second phase comprising a chlorinating reagent; and (b) reacting the sucrose-6-ester with the chlorinating reagent, to prepare a sucralose-6-ester. In addition, processes for preparing sucralose from sucrose-6-esters are provided.
Sucrose-6-Ester Chlorination by Co-Addition of Chlorination Reagent
申请人:Ratnam Rakesh
公开号:US20080004439A1
公开(公告)日:2008-01-03
An improved process for chlorination is described wherein a solution of chlorinating agent and solution of sucrose-6-ester are mixed together by co-addition to a reaction vessel, the addition of both the reactants starting and completing substantially at the same time. The product of chlorinated sucrose is further extracted in organic solvents and deacylated to produce the high intensity sweetener product 4, 1′, 6′ trichlorogalactosucrose.
[EN] CHLORINATION OF CARBOHYDRATES AND CARBOHYDRATE DERIVATIVES<br/>[FR] CHLORATION DE GLUCIDES ET DÉRIVÉS DE GLUCIDES
申请人:LEXINGTON PHARMACEUTICALS LAB LLC
公开号:WO2013056128A1
公开(公告)日:2013-04-18
Disclosed is a method for chlorinating a carbohydrate or a derivative thereof to produce a polychlorinated carbohydrate or a derivative thereof, such as sucralose, the method involves (i) reacting the carbohydrate or derivative thereof with a chlorinating agent to obtain a reaction mixture comprising said polychlorinated carbohydrate or derivative thereof and at least one under-chlorinated carbohydrate or derivative thereof, (ii) returning the at least one under-chlorinated carbohydrate or derivative thereof to a chlorinating step and further chlorinating the at least one under-chlorinated carbohydrate or derivative thereof to obtain the desired polychlorinated carbohydrate or derivative thereof; and (iii) optionally repeating steps (i) and (ii) "n" times where n ≥ 1. The polychlorinated carbohydrate or a derivative thereof is obtained in high yields.