Process for preparation of tamsulosin and its aralkylamine derivatives
申请人:Jih Hwu Ru
公开号:US20070015939A1
公开(公告)日:2007-01-18
The present invention discloses a new process for the synthesis of tamsulosin and its aralkylamine derivatives, especially (R)-(−)-5-2-[2-(2-alkoxyphenoxy)ethylamino]propyl}-2-alkoxybenzenesulfonamides having the following formula 1 (where R
1
and R
2
represent C
1
-C
4
alkyl groups) and their hydrochloride thereof, and other various pharmaceutical used salts.
Tamsulosin hydrochloride (R
1
=Et, R
2
=Me, in its hydrochloride salt form) is an antagonist of α-A adrenoceptors in the prostate. Tamsulosin•HCl occurs as white crystals, which melt with decomposition at approximately 230° C. It is sparingly soluble in water and in methanol, slightly soluble in glacial acetic acid and in ethanol, and practically insoluble in ether.
Amine dehydrogenases: efficient biocatalysts for the reductive amination of carbonyl compounds
作者:Tanja Knaus、Wesley Böhmer、Francesco G. Mutti
DOI:10.1039/c6gc01987k
日期:——
Amines constitute the major targets for the production of a plethora of chemical compounds that have applications in the pharmaceutical, agrochemical and bulk chemical industries. However, the asymmetric synthesis of...
The highly efficient and direct asymmetric reductive amination of arylacetones catalyzed by an iridium complex for the preparation of enantiomerically pure β‐arylamines is described. The monodentate phosphoramidite ligand exhibits superb reactivity (TONs of up to 20 000) and enantioselectivity (up to 99 % ee). Additives played important roles in this reductive coupling reaction.
Stereoselectivity of Four (R)-Selective Transaminases for the Asymmetric Amination of Ketones
作者:Francesco G. Mutti、Christine S. Fuchs、Desiree Pressnitz、Johann H. Sattler、Wolfgang Kroutil
DOI:10.1002/adsc.201100558
日期:2011.11
Four (R)-ω-transaminases originating from Hyphomonas neptunium (HN-ωTA), Aspergillus terreus (AT-ωTA) and Arthrobacter sp. (ArR-ωTA), as well as an evolved transaminase (ArRmut11-ωTA) were successfully employed for the amination of prochiral ketones leading to optically pure (R)-amines. The first three transaminases displayed perfect stereoselectivity for the amination of all substrates tested (ee
Direct condensation of β‐arylketones with acetamide afforded both Z and E enamides. The Z‐configured substrates underwent hydrogenation with excellent enantioselectivity by using the Rh/tangphos catalytic system (see scheme; tangphos=1,1′‐di‐tert‐butyl‐[2,2′]‐diphospholanyl). The product β‐arylisopropylamines are important precursors to several drugs.