Dibutylphosphate (DBP) mediated synthesis of cyclic N,N′-disubstituted urea derivatives from amino esters: a comparative study
作者:Sumit K. Agrawal、Manisha Sathe、A.K. Halve、M.P. Kaushik
DOI:10.1016/j.tetlet.2012.08.083
日期:2012.11
The N,N′-disubstituted urea derivatives such as amino acid hydantoins and dihydrouracil derivatives were prepared starting from natural and unnatural amino acid esters using dibutylphosphate (DBP). During the attempted synthesis of N-heterocycles with larger than six-membered rings containing the N,N′-disubstituted urea functionalities, three unexpected products namely squamolone, N-methyl pyrrolidine-2-one
Novel inhibitors of bone reabsorption and antagonists of vitronectin receptors
申请人:——
公开号:US20010021708A1
公开(公告)日:2001-09-13
The present invention relates to 5-membered ring heterocycles of the formula I,
1
in which E, F, G, W, Y and Z have the meaning given in the patent claims, to their preparation and to their use as medicaments.
The novel compounds are used as vitronectin receptor antagonists and as inhibitors of bone reabsorption.