Direct Copper-Catalyzed C-H Monofluoroalkylation of Benzoxazoles with 1-Fluoro-1-haloalkanes
作者:Wei Li、Andrii Varenikov、Mark Gandelman
DOI:10.1002/ejoc.201901929
日期:2020.6.8
Copper‐catalyzed cross‐coupling reaction allowed the first directC–Hmonofluoroalkylation of benzoxazole with 1‐fluoro‐1‐haloalkanes, which bear β‐hydrogens and no directing groups in vicinity to the reaction center.
[EN] IMPROVED FINGOLIMOD PROCESS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE FINGOLIMOD AMÉLIORÉ
申请人:EMCURE PHARMACEUTICALS LTD
公开号:WO2015107548A1
公开(公告)日:2015-07-23
The present invention relates to a novel synthetic route for the preparation of fingolimod and its pharmaceutically acceptable salts. The synthetic strategy comprises reaction of 2-(4- octylphenyl)-acetaldehyde with nitro acetonide, and subsequent conversions of the resulting acetonide protected nitro-alcohpl intermediates of formulae (8), (9) and (10) to the penultimate acetonide protected amino intermediates of formula (11), which on deprotection with acid yields Fingolimod and its corresponding salts, having purity conforming to regulatory specification.
New compounds of the formula
wherein:
Ar1 and Ar2 are each independently optionally substituted phenyl;
R', R2 and R3 are each independently hydrogen or alkyl;
a is an integer from 1-3;
b is an integer from 1-3;
c is an integer from 0-2; and
d is an integer from 0-2, such that (c + d) equals 0-2; and the pharmaceutically acceptable non-toxic acid addition salts thereof, are spermicidal and, therefore, are useful as contraceptives.
式中的新化合物
其中
Ar1 和 Ar2 各自独立地为任选取代的苯基;
R'、R2 和 R3 各自独立地为氢或烷基
a 是 1-3 的整数
b 是 1-3 的整数
c 是 0-2 的整数;以及
d 是 0-2 的整数,这样 (c + d) 等于 0-2;其药学上可接受的无毒酸加成盐具有杀精子作用,因此可用作避孕药。
Relative rates for the addition reactions of the malonyl radical to substituted styrenes induced by cerium(IV) ammonium nitrate and tributyltin hydride. A comparison