Acid-catalyzed rearrangements of N-nitrosodehydromorpholine
摘要:
N-Nitrosodehydromorpholine, a potential metabolic intermediate in the carcinogenic activation of N-nitrosodiethanolamine, and N-nitrosomorpholine, was prepared from the hemiacetal N-nitroso-2-hydroxymorpholine (2) by tosylation and in situ base-catalyzed elimination. The attempted acid-catalyzed hydration of 3 gives neither 2 nor the unstable alpha-hydroxynitrosamine, N-nitroso-3-hydroxymorpholine (4). The product of this transformation is N-(2-hydroxyethyl)-2-oximinoethanamide (5) as confirmed by an X-ray crystallographic determination. Treatment of 3 with gaseous HCl in CH2Cl2 gives 1-aza-4-oxa-3-oximinocyclohexene (6), which rearranges to 5 upon treatment with aqueous acid. The initial rearrangement was proven to be intermolecular by means of a crossover experiment employing (NO)-N-15 and C-5-D-2 isotopomers of 3.
functionalizations of C60 with amino alcohols with aerobic oxygen as the sole oxidant have been explored. For 2-/3-amino alcohols, an aminooxygenation reactionoccurs to generate fulleromorpholine and fullerooxazepane derivatives. When a tethered furan ring exists, a further intramolecular [4 + 2] reaction with the neighboring double bond occurs to furnish the cis-1 products. In the case of 4-/5-amino
Substituted quinazoline derivatives as inhibitors of aurora kinases
申请人:Jung Henri Frederic
公开号:US20050070561A1
公开(公告)日:2005-03-31
The invention provides quinazoline derivatives of formula (I): in the preparation of a medicament for use in the inhibition of Aurora kinase and also novel quinazoline derivatives, processes for their preparation, pharamceutical compositions containing them and their use in therapy.
Substituted Quinazoline Derivatives as Inhibitors of Aurora Kinases
申请人:Jung Frederic Henri
公开号:US20090215770A1
公开(公告)日:2009-08-27
The invention provides quinazoline derivatives of formula (I):
in the preparation of a medicament for use in the inhibition of Aurora kinase and also novel quinazoline derivatives, processes for their preparation, pharmaceutical compositions containing them and their use in therapy.