RO98498B1

RO98498B1 - Process for preparing propylene circular dihydripiridine-5-phosphoric acid esters derivatives

Info

Publication number: RO98498B1
Application number: RO129352A
Authority: RO
Inventors: Kiyotomo Seto; Sakuya Tanaka; Ryozo Sakoda; Tosinori Sakai; Yukinori Nasuda
Original assignee: Nissan Chemical Industries Ltd
Priority date: 1987-08-06
Filing date: 1987-08-06
Publication date: 1990-03-30

Abstract

Inventia de fata se refera la un procedeu de obtinere a derivatilor de esteri propilenici ciclici ai acidului dihidropiridinic-5-fosfonic, cu formula generala I: (vezi descriere), în care R1, R2, R3, R4, R5, R6, x1 si x2 pot fi identici sau diferiti si reprezinta hidrogen sau un radical alchil cu 1...4 atomi de carbon, unul din radicalii x1 si x2 reprezinta nitro, fluor, clor, difluormetoxi sau trifluormetil si celalalt radical hidrogen sau ambii radicali x1 si x2 reprezinta clor si y reprezinta radicalul: (vezi descriere), în care A este un radical alchilen cu 2...6 atomi de carbon, fiecare, din radicalii Ar1 si Ar2 sunt identici sau diferiti si reprezinta un radical fenil care poate fi substituit cu clor, fluor sau alcoxi cu 1...3 atomi de carbon si m este un numar întreg cuprins între 0 si 4 sau y reprezinta radicalul: (vezi descriere), în care A, Ar1 si Ar2 au semnificatiile de mai sus când ambii radicali x1 si x2, reprezinta clor, se supune reactiei un compus cu formula generala II: (vezi descriere), în care radicalii R1, R2, R3, R4, R5, R6, x1 si x2 au semnificatiile de mai sus, cu un compus cu formula generala III: (vezi descriere), în care Y are semnificatiile de mai sus, în mediu de solvent inert, la o temperatura cuprinsa între temperatura camerei si 200 degree C, la un raport molar compus III/compus II, 0,5...2,0.The present invention relates to a process for the preparation of dihydropyridine-5-phosphonic acid esters of cyclic propylene esters of the general formula I: (see description) wherein R1, R2, R3, R4, R5, R6, x1 and x2 may be the same or different and represent hydrogen or an alkyl radical of 1-4 carbon atoms, one of the radicals x1 and x2 represents nitro, fluoro, chloro, difluoromethoxy or trifluoromethyl and the other radical hydrogen or both radicals x1 and x2 represent chlorine and y represents the radical: wherein A is an alkylene radical of 2 to 6 carbon atoms, each of the radicals Ar1 and Ar2 being the same or different and represents a phenyl radical which may be substituted by chlorine , fluorine or alkoxy of 1 to 3 carbon atoms and m is an integer ranging from 0 to 4 or y represents the radical: wherein A, Ar 1 and Ar 2 are as defined above when both x 1 and x2 represents chlorine, a compound of formula (I) is reacted wherein R 1, R 2, R 3, R 4, R 5, R 6, x 1 and x 2 are as defined above, with a compound of the general formula III: wherein Y has the meanings above, in an inert solvent medium, at a temperature comprised between room temperature and 200 ° C, at a compound III / compound II molar ratio of 0.5 ... 2.0.