Practical enantioselective synthesis of lamivudine (3TC™) via a dynamic kinetic resolution
作者:Michael D. Goodyear、Malcolm L. Hill、Jono P. West、Andrew J. Whitehead
DOI:10.1016/j.tetlet.2005.10.002
日期:2005.12
A practical enantioselectivesynthesis of lamivudine 1 is described. A highly effective dynamickineticresolution of the 5-hydroxyoxathiolane, followed by chlorination and introduction of cytosine provides an efficient synthesis of lamivudine.
[EN] NOVEL PROCESS FOR THE PREPARATION OF CIS-NUCLEOSIDE DERIVATIVE<br/>[FR] NOVEAU PROCEDE DE PREPARATION DE DERIVE DE CIS-NUCLEOSIDE
申请人:MATRIX LAB LTD
公开号:WO2011095987A1
公开(公告)日:2011-08-11
The present invention relates to an improved process for the preparation of cis-nucleoside derivative of formula-1 involving chlorination of the compound of formula-2 followed by reaction with compound of formula-3 in presence of a base to get compound of formula-4, reacting the compound of formula-4 with an alkyl halide (RiX) to get a quaternary ammonium salt then with cytosine derivative of formula-5 to provide the compound of formula-6, optionally de-protecting the compound of formula-6 to the compound of formula-7, reducing compound of formula-7 with metal catalyst in presence of a buffer solution, then adding an organic acid to get the compound of formula-8, and converting the compound of formula-8 to cis-nucleoside derivative of formula-1. The present invention further relates to novel cis-nucleoside derivative of formula-8. The present invention also relates to a pharmaceutical composition comprising cis-nucleoside derivative of formula-1 with excipients.
PROCESS FOR PREPARATION OF CIS-NUCLEOSIDE DERIVATIVE
申请人:Shankar Rama
公开号:US20110282046A1
公开(公告)日:2011-11-17
The present invention relates to a novel and stereoselective synthetic process for the preparation of optically active cis-nucleoside derivatives of compound of Formula (I), wherein R
3
represents H, F, Cl, C
1-16
alkyl.
Synthesis of an Oxathiolane Drug Substance Intermediate Guided by Constraint-Driven Innovation
作者:K. Kashinath、David R. Snead、Justina M. Burns、Rodger W. Stringham、B. Frank Gupton、D. Tyler McQuade
DOI:10.1021/acs.oprd.0c00145
日期:2020.10.16
A new route was developed for construction of the oxathiolane intermediate used in the synthesis of lamivudine (3TC) and emtricitabine (FTC). We developed the presented route by constraining ourselves to low-cost, widely available starting materials—we refer to this as supply-centered synthesis. Sulfenyl chloride chemistry was used to construct the framework for the oxathiolane from acyclic precursors
[EN] PROCESS AND INTERMEDIATES FOR THE PREPARATION OF SUBSTITUTED 1, 3-OXATHIOLANES, ESPECIALLY LAMIVUDINE<br/>[FR] PROCÉDÉS INTERMÉDIAIRES POUR LA PRÉPARATION DE 1,3-OXATHIOLANES SUBSTITUÉS, NOTAMMENT DE LAMIVUDINE
申请人:RANBAXY LAB LTD
公开号:WO2009069012A1
公开(公告)日:2009-06-04
The present invention relates to process and intermediates for the preparation of substituted 1,3-oxathiolanes. The present invention specifically relates to a process for the preparation of lamivudine.