13C and31P NMR studies of some aminophosphonium chlorides
作者:Larry K. Krannich、Ravindra K. Kanjolia、Charles L. Watkins
DOI:10.1002/mrc.1260250409
日期:1987.4
magnitude of 2J(PC). Substitution of a Me2N group for an alkyl or aryl group produces an increase in the 31P chemical shift and in the magnitude of 1J(PC). α‐ and β‐deshielding and γ‐shielding effects are noted in the 13C NMR spectra and β‐deshielding and γ‐shielding effects are noted in the 31P NMR spectra with substitution on the phosphorus and nitrogen atoms.
[EN] PROCESS FOR THE PREPARATION OF ROFLUMILAST<br/>[FR] PROCEDE DE PREPARATION DE ROFLUMILAST
申请人:RANBAXY LAB LTD
公开号:WO2005026095A1
公开(公告)日:2005-03-24
The present invention relates to a process for the preparation of 3-cyclopropylmethoxy-4-difluromethoxy benzoic acid of structural Formula I, and to the use of this compound as an intermediate for the preparation of roflumilast.
A disulfone compound represented by the general formula (3):
1
wherein Ar is optionally substituted aryl, Y is hydrogen or oxo, and each wavy line represents either of E/Z geometrical isomers or a mixture thereof; a process for the preparation of the compound; intermediates thereof; and a process for the preparation of a carotenoid represented by the general formula (4):
2
wherein Y and each wavy line are as defined above, comprising reacting a disulfone compound of the general formula (3) with a basic compound.
[EN] PROCESS FOR THE PREPARATION OF DONEPEZIL AND DERIVATIVES THEREOF<br/>[FR] PROCEDE DE PREPARATION DE DONEPEZIL ET DE SES DERIVES
申请人:RANBAXY LAB LTD
公开号:WO2004082685A1
公开(公告)日:2004-09-30
The invention relates to processes for the preparation of piperidylmethyl-indanones, and to the use of these compounds as intermediates for the preparation of benzyl-piperidylmethyl-indanones which are active compounds for the treatment of CNS disorders. The invention also relates to a process for the preparation of donepezil or a pharmaceutically acceptable salt thereof, and pharmaceutical compositions that include the donepezil or a pharmaceutically acceptable salt thereof.
Dihalo-compound and process for producing vitamin A derivative
申请人:——
公开号:US20010025127A1
公开(公告)日:2001-09-27
There is disclosed a dihalo-compound of formula (1):
1
wherein X
1
and X
2
represent different halogen atoms, R represents a hydrogen atom or a protective group for a hydroxyl group, and a process for producing vitamin A derivative via a sulfone derivative of formula (5):
2
wherein Ar represents an optionally substituted aryl group, and R represents the same as defined above.