The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.)

Subclass of:

544 - Organic compounds -- part of the class 532-570 series

544000000 - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1)

544000000 - HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1)

544001000 - Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.)

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application number	Description	Number of patent applications / Date published
544242000	1,3-diazines	784
544336000	1,4-diazines	453
544225000	Heavy metal or aluminum containing	69
544238000	1,2-diazines which contain an additional hetero ring	46
544229000	Boron or silicon containing	38
544233000	Polycyclo ring system having a 1,2-diazine ring as one of the cyclos	33
544230000	Spiro	28
544239000	Chalcogen bonded directly to ring carbon of a 1,2-diazine ring	6
544232000	Phosphorus attached directly or indirectly to a 1,2-diazine ring by nonionic bonding	2
20090118504	Novel phosphonic acid compounds as inhibitors of serine proteases - The present invention is directed to phosphonic acid compounds useful as serine protease inhibitors, compositions thereof and methods for treating inflammatory and serine protease mediated disorders.	05-07-2009
20090124801	Process for synthesizing phosphonic and phosphinic acid compounds - The present invention is directed to an improved process for synthesizing phosphonic and phosphinic acid chymase inhibitor compounds.	05-14-2009

Entries
Document	Title	Date
20090076266	COPPER-CATALYZED C-H BOND ARYLATION - The present invention is a one-step method for efficiently converting carbon-hydrogen bonds into carbon-carbon bonds using a combination of aryl halides, a substrate, and a copper salt as catalyst. This method allows faster introduction of complex molecular entities, a process that would otherwise require many more steps. This invention is particularly relevant for the organic synthesis of complex molecules such as, but not limited to, pharmacophores and explosives.	03-19-2009
20090105475	PROCESS FOR PRODUCING 2,3-DIHYDROPYRIDAZINE COMPOUND - A process for producing a 2,3-dihydropyridazine compound represented by the formula (2):	04-23-2009
20090234118	Ionic Liquids - The present invention relates to compositions of matter that are ionic liquids, the compositions comprising any of eleven cations combined with any of three fluorinated sulfonated anions. Compositions of the invention should be useful as solvents and, perhaps, as catalysts for many reactions, including aromatic electrophilic substitution, nitration, acylation, esterification, etherification, oligomerization, transesterification, isomerization and hydration.	09-17-2009
20120178927	CYCLOALKYLPHENYL SUBSTITUTED CYCLIC KETOENOLS - The invention relates to novel cycloalkylphenyl-substituted cyclic ketoenols of the formula (I)	07-12-2012
20150376138	PROCESS FOR PRODUCING PYRIDAZINONE COMPOUND AND PRODUCTION INTERMEDIATES THEREOF - The present invention provides a process for producing a compound of the formula (1) wherein X represents a hydrogen atom, etc., and Y represents a hydrogen atom, etc., which comprises step 1 of reacting a compound of the formula (2) and a compound of the formula (3) in the presence of a Lewis acid wherein R represents a hydrogen atom, etc., to obtain an adduct, and step 2 of reacting the adduct obtained in the step 1 and hydrazine to obtain the compound of the formula (1).	12-31-2015