Janus molecules: Synthesis of double-headed heterocycles containing two identical hydrogen bonding arrays
作者:Andrew Marsh、Ernest G. Nolen、Kevin M. Gardinier、Jean-Marie Lehn
DOI:10.1016/0040-4039(94)85063-1
日期:1994.1
The synthesis of three heterocycles 1–3 presenting identical faces containing a hydrogenbonding code for self-assembly is described. Pyrimidoquinazolinetetrone 1 and diaminopyrimidoquinazolinedione 2 were approached using a double Chapman rearrangement followed by closure to the double uracil-type structure 1. Diaminopyridoisoquinolinedione 3 was obtained in three steps from pyromellitic anhydride
Intermediates for the preparation of citalopram and escitalopram
申请人:Pittelkow Thomas
公开号:US20080058536A1
公开(公告)日:2008-03-06
Methods for manufacture of 5-alkoxycarbonylphthtalides are disclosed. The 5-alkoxycarbonylphthtalides are useful in syntheses of the well-known antidepresssants citalopram and escitalopram.