ZA200302030B

ZA200302030B - Aliphatic nitrogen-containing 5-membered ring compound.

Info

Publication number: ZA200302030B
Application number: ZA200302030A
Authority: ZA
Inventors: Kosuke Yasuda; Hiroshi Morimoto; Saburo Kawanami; Masataka Hikota; Takeshi Matsumoto; Kenji Arakawa
Original assignee: Tanabe Seiyaku Co
Priority date: 2000-10-12
Filing date: 2003-03-13
Publication date: 2003-09-26

Description

SPECIFICATION

ALIPHATIC NITROGEN-CONTAINING 5-MEMBERED RING COMPOUND he 5 TECHNICAL FIELD -The present invention relates to a novel aliphatic

E nitrogen-containing 5-membered ring compound having superior dipeptidylpeptidase IV (DPPIV) inhibitory action that is useful as a pharmaceutical.

BACKGROUND ART

Dipeptidylpeptidase IV (DPPIV) 1s a kind of serine protease that specifically hydrolyzes a dipeptide of Xaa-

Pro or Xaa-Ala (where Xaa may be any amino acid) from the N terminus of a polypeptide chain.

There are various reports regarding the role of DPPIV {also called to as CD26) in the body and its relationship with diseases (Holst, et al., Diabetes, Vol. 47, pp. 1663- 1670, 1998; Augustyns, et al., Current Medicinal Chemistry,

Vol. 6, pp. 311-327, 1999; Meester, et al., Immunol. Today,

Vol. 20, pp. 367-375, 1999; and, Fleicher, et al., Immunol.

Today, Vol. 15, pp. 180-184, 1994).

GLP-1 (glucagon-like peptide 1) is a peptide hormone that mainly acts in the pancreas after being secreted from the lower small intestine after meals, and primarily has the function of amplifying glucose-induced insulin secre-

B tion. In addition, there are several reports suggesting } that GLP-1 has an appetite- suppressing action. DPPIV hydrolyzes GLP-1, forming an inactive or antagonistic peptide.

Substances that inhibit the enzyme activity of DPPIV enhance the insulin secretion response to oral glucose loading by enhancing the action of intrinsic GLP-1, thereby improving impaired glucose tolerance.

Consequently, DPPIV inhibitors are considered to be useful for the prophylaxis and treatment of diabetes

(particularly type 2 diabetes), etc. Also, they are expected to be effective for the prophylaxis and treatment of other diseases induced or exacerbated by impaired glucose tolerance (including hyperglycemia (such as postprandial hyperglycemia), hyperinsulinemia, diabetes complications (such as renal disorder and neurological disorder), lipid metabolism disorder and obesity, etc.) .

Moreover, DPPIV inhibitors are also expected to be effective for the prophylaxis and treatment of diseases that are to be improved by enhancing the appetite-suppress- ing action of GLP-1 (including overeating and obesity, etc.) .

Also, DPPIV (CD26) present on the surface of T cells is strongly upregulated following T cell activation, and plays an important role in the activation and proliferation of T cells. T cell activity is known to be suppressed when

DPPIV (CD26) is blocked by antibodies or inhibitory sub- stances. Also, there has been an interest in the correla- tion between this enzyme and the pathological state in collagen metabolism disorders and diseases associated with abnormal immunity. For example, the DPPIV (CD26) positive rate of peripheral blood T cells is elevated in rheumatoid patients, and high levels of DPPIV activity have been detected in the urine of nephritis patients. Moreover,

DPPIV (CD26) is also thought to play an important role in the entry of HIV into lymphocytes. . ©

Consequently, substances that inhibit DPPIV (CD26) are expected to demonstrate prophylactic and therapeutic effects against diseases including autoimmune diseases ’ (such as arthritis and rheumatoid arthritis), osteoporosis, acquired immunodeficiency syndrome (AIDS) and rejections of transplanted organs and tissues.

On the other hand, as compounds having DPPIV inhibit- ory action, there are described 2-cyanopyrrolidine deriva- tives having DPPIV inhibitory action in International

Patent Laid-Open Publications Nos. W098/19998 and

WO00/34241.

The present invention provides a novel aliphatic nitrogen-containing 5-membered ring compound having an excellent DPPIV inhibitory action.

DISCLOSURE OF THE INVENTION

: As a result of earnest research to solve the above problems, the present inventors found a novel aliphatic nitrogen-containing 5-membered ring compound having DPPIV inhibitory action, thereby accomplished the present invention.

Namely, the present invention relates to an aliphatic nitrogen-containing 5-membered ring compound represented by the formula [I]:

RT rex YY nH-Crz-00-N 1)

CN wherein A represents -CH;- or -S-,

R! represents hydrogen atom, a lower alkyl group, a hydroxy lower alkyl group or a lower alkoxy lower alkyl group,

X represents -N(R))-, -O- or -CO-, where R® repre- sents hydrogen atom or a lower alkyl group, and ) R? represents (1) a cyclic group which may be substituted, where the cyclic group portion is (i) a monocyclic, bicyclic or tricyclic hydrocarbon group, Or (ii) a monocyclic, bicyclic or tricyclic hetero- cyclic group, or (2) an amino group which may be substituted, or a pharmaceutically acceptable salt thereof.

BEST MODE FOR CARRYING OUT THE INVENTION

Although optical isomers based on an asymmetric carbon can be present in the objective compound [I] of the present invention, the present invention includes any of these optical isomers as well as mixtures thereof. In addition, although isomers (cis form or trans form) are also present based on the relative positions of substi- tuents with respect to the standard plane of a cyclic group, the present invention also includes any of these isomers as well as mixtures thereof.

In the present invention, examples of a lower alkyl group, a lower alkylthio group, a lower alkylsulfonyl group, a lower alkoxy group and a lower alkylamino group include linear or branched groups having 1 to 6 carbon atoms, and particularly those having 1 to 4 carbon atoms. And, exam- ples of a lower alkanoyl group and a lower alkanoylamino group include linear or branched groups having 2 to 7 carbon atoms, and particularly those having 2 to 5 carbon atoms. Examples of a lower cycloalkyl group and lower cycloalkenyl group include those having 3 to 8 carbon atoms, and particularly 3 to 6 carbon atoms. Examples of a lower alkylene group include linear or branched groups having 1 to 6 carbon atoms, and particularly 1 to 4 carbon atoms.

Examples of a lower alkenyl group and lower alkenylene group include those having 2 to 7 carbon atoms, and parti- cularly 2 to 5 carbon atoms. Further, examples of a halo- gen atom include fluorine, chlorine, bromine and iodine.

In the objective compound [I] of the present inven- tion, examples of hydrogen atom or a lower alkyl group represented by R® include hydrogen atom, methyl group, etc.

Among them, hydrogen atom is more preferred.

In the compound [I] of the present invention, exam- ples of "hydrogen atom, a lower alkyl group, a hydroxy lower alkyl group or lower alkoxy lower alkyl group" represented by R! include hydrogen atom, methyl group, hydroxymethyl group and methoxymethyl group. Among them,

: hydrogen atom is preferred. '

In the compound [I] of the present invention, a cyclic group portion of "a cyclic group which may be substituted" represented by R? includes (i) a monocyclic, bicyclic or tricyclic hydrocarbon group - and (ii) a monocyclic, bicyclic or tricyclic heterocyclic group.

Such monocyclic, bicyclic or tricyclic hydrocarbon groups include those having 3 to 15 carbon atoms, which may be partially or completely saturated.

Monocyclic hydrocarbon groups include those having 3 to 7 carbon atoms, examples of which include phenyl group, cyclohexyl group, cyclopentyl group, cyclobutyl group, cyclopropyl group, etc.

Bicyclic hydrocarbon groups include those having 9 to 11 carbon atoms, examples of which include an indanyl group, an indenyl group, a naphthyl group, a tetrahydronaphthyl group and partially or completely saturated cyclic groups thereof, etc.

Tricyclic hydrocarbon groups include those having 12 to 15 carbon atoms, examples of which include a fluorenyl group, an anthryl group, a phenanthryl group and partially or completely saturated cyclic groups thereof, etc.

Monocyclic, bicyclic or tricyclic heterocyclic groups include a monocyclic, bicyclic or tricyclic heterocyclic group containing 1 to 4 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, which may be partially or completely saturated. }

Monocyclic heterocyclic groups include a heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising of a saturated or unsaturated 5- to 7-membered ring, examples of which include: pyrrolidinyl group, an imidazolidinyl group, a pyrazolidinyl group, an oxolanyl group, a thiolanyl group, a pyrrolinyl group, an imidazolinyl group, a pyrazolinyl group, a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a triazolyl group, a tetrazolyl group, a furyl group, an oxazolyl group, an isoxazolyl group, an oxadiazolyl group, a thienyl group, a thiazolyl group, an isothiazolyl group, a thiadiazolyl group, a piperidyl group, a pipera- ’ 5 zinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a " pyridazinyl group, a pyranyl group, a tetrahydropyridyl group, a dihydropyridazinyl group, a perhydroazepinyl group, a perhydrothiazepinyl and partially or completely saturated cyclic groups thereof, etc.

Bicyclic heterocyclic groups include a heterocyclic group containing 1 to 3 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising two saturated or unsaturated 5- to 7-membered rings being fused, examples of which include: an indolinyl group, an isoindolinyl group, an indolyl group, an indazolyl group, an isoindolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzoxazolyl group, a benzodioxolanyl group, a benzothienyl group, a benzofuryl group, a thienopyridyl group, a thiazolopyridyl group, a pyrrolopyridyl group, a dihydropyrrolopyridyl group, a quinolyl group, an isoquinolyl group, a quinoxalinyl group, : a quinazolinyl group, a phthalazinyl group, a cinnolinyl group, a chromanyl group, an isochromanyl group, a naphthyridinyl group and partially or completely saturated " cyclic groups thereof, etc. : Tricyclic heterocyclic groups include a heterocyclic group containing 1 to 4 hetero atoms selected from nitrogen - atom, oxygen atom and sulfur atom and comprising three ) 30 saturated or unsaturated 5- to 7-membered rings being fused, examples of which include: a benzoxolanopyrimidyl group, a B-carbolinyl group, a carbazolyl group, a phenothiazinyl group, a phenoxazinyl group and partially or completely saturated cyclic groups thereof, etc.

Among these cyclic groups (monocyclic, bicyclic or tricyclic hydrocarbon groups or monocyclic, bicyclic or tricyclic heterocyclic groups),

) “(i) a monocyclic hydrocarbon group having 3 to 7 carbon atoms, : (ii) a bicyclic hydrocarbon groups having 9 to 11 carbon : atoms,

i (iii) a monocyclic heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, or

(iv) a bicyclic heterocyclic group containing 1 to 3 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising two 5- to 7-membered rings being fused" is preferred, examples of which include: "phenyl group, cyclohexyl group, cyclopentyl group, cyclo- butyl group, cyclopropyl group, an indanyl group, an indenyl group, a naphthyl group, tetrahydronaphthyl, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidin- vl group, an oxolanyl group, a thiolanyl group, a pyrrol- inyl group, an imidazolinyl group, a pyrazolinyl group, a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a triazolyl group, a tetrazolyl group, a furyl group, an oxazolyl group, an isoxazolyl group, an oxadiazolyl group, a thienyl group, a thiazolyl group, an isothiazolyl group, a thiadiazolyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyranyl group, a tetrahydropyridyl . group, a dihydropyridazinyl group, a perhydroazepinyl group, a perhydrothiazepinyl group, an indolinyl group, an iso- indolinyl group, an indolyl group, an indazolyl group, an isoindolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzoxazolyl group, a benzodioxolanyl group, a benzothienyl group, a benzofuryl group, a thiencpyridyl group, a thiazolopyridyl group, a pyrrolopyridyl group, a dihydropyrrolopyridyl group, a quinolyl group, an iso- quinolyl group, a quinoxalinyl group, a quinazolinyl group,

a phthalazinyl group, a cinnolinyl group, a chromanyl group, an isochromanyl group, a naphthyridinyl group and partially . or completely saturated cyclic groups thereof, etc.*.

Among them, more preferred examples include: "phenyl group, cyclohexyl group, a pyrrolidinyl group, a tetrazolyl group, a furyl group, a thienyl group, a thia- zolyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a perhydroazepinyl group, an indolinyl group, an isoindol- inyl group, a benzothienyl group, a thienopyridyl group, a pyrrolopyridyl group, a dihydropyrrolopyridyl group, a quinolyl group, an isogquinolyl group, a quinoxalinyl group and partially or completely saturated cyclic groups thereof, etc.", and further preferred examples include: "a pyrrolidinyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, an indolinyl group, an isoindolinyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group and partially or completely saturated cyclic groups thereof, etc."

Among them, particularly preferred examples include: "].-pyrrolidinyl group, 1l-piperidyl group, l-piperazinyl group, 4-morpholinyl group, 4-thiomorpholinyl group, 2- pyridyl group, 2-pyrimidinyl group, 2-isoindolinyl group, 1-indolinyl group, 2,3-dihydro-1H-pyrrolo[3,4-blpyridin-2- yl group, etc.". 3 ’ "A cyclic group (a monocyclic, bicyclic or tricyclic : hydrocarbon group or a monocyclic, bicyclic or tricyclic heterocyclic group) which may be substituted " represented by R? may be unsubstituted or have 1 to 3 substituents which are the same or different.

Substituents in the cyclic group are not particularly limited, and examples of which include substituents selected from the following "substituents of Group A".

Among them, "substituents of Group A'" are more preferred.

CC - 9 -

In the objective compound {I] of the present invention, "an amino group which may be substituted” represented by R? may be unsubstituted or may be an amino group having 1 or 2 substituents which are the same or different (a mono- or di-substituted amino group).

Co Substituents in the amino group are not particularly limited, and examples of which include substituents So selected from the following "substituents of Group B".

Among them, "substituents of Group B'" are more preferred. "An amino group which may be substituted" represented by R? is preferably a substituted amino group (a mono- or di-substituted amino group), and more specifically "an amino group substituted by 1 or 2 substituents which are the same or different and selected from the group consist- ing of a lower alkyl group (methyl group, ethyl group, isopropyl group, butyl group, etc.), a lower cycloalkyl group, a lower alkoxy-substituted lower alkyl group, a pyrimidinyl group, a thiazolyl group and a thiadiazolyl group" is preferred. Among them, "(i) an amino group di-substituted by substituents which are the same or different and selected from a lower alkyl group (methyl group, ethyl group, isopropyl group, butyl group, etc.), a lower cycloalkyl group and a lower alkoxy- substituted lower alkyl group; or (ii) an amino group mono-substituted by a substituent selected from a pyrimidinyl group, a thiazolyl group and a ‘thiadiazolyl group" is more preferred, and . "an amino group di-substituted by substituents which are the same or different and selected from a lower alkyl group (methyl group, ethyl group, isopropyl group, butyl group, etc.), a lower cycloalkyl group and a lower alkoxy-substi- tuted lower alkyl group" is particularly preferred. ----Substituents of Group A:-------c------

As substituents of Group A, the following substi- tuents are mentioned: a halogen atom (Cl, F, Br, etc.); cyano group; nitro group,

oxo group, hydroxy group, carboxy group; oxidyl group; amino group; carbamoyl group; aminosulfonyl group; a lower alkyl group; a lower alkoxy group; a lower alkanoyl group; a lower alkoxycarbonyl group; a lower alkoxy-substituted lower alkanoyl group; a lower alkoxycarbonyl-substituted ) . lower alkoxy group; a lower alkoxycarbonyl-substituted lower alkoxycarbonyl group; a lower alkylthio group; . Co a lower alkylsulfonyl group; a di-lower alkylamino-substituted lower alkoxy group; a di-lower alkylaminocarboxy group; a lower alkyl group substituted by group(s) selected from amino group, carbamoyl group, a halogen atom, hydroxy group, carboxy group, a lower alkoxy group and a mono- or di- substituted amino group (substituents in the substituted amino group portion are not particularly limited, and examples of which include substituents of Group C mentioned below.) ; a mono- or di-substituted amino group or a mono- or di- substituted carbamoyl group (substituents in the substituted amino group or substituted carbamoyl group are not particularly limited, and examples of which include substituents of Group C mentioned below.); a substituted or unsubstituted lower cycloalkyl group, a substituted or unsubstituted lower cycloalkyl-CO-, a substituted or unsubstituted lower cycloalkyl-lower alkyl : group, oo a substituted or unsubstituted phenyl group, a substituted or unsubstituted phenyl-O-, - a substituted or unsubstituted phenyl -CO-, a substituted or unsubstituted phenyl-lower alkyl group, a substituted or unsubstituted phenyl-O-lower alkyl group, a substituted or unsubstituted phenylsulfonyl group, a substituted or unsubstituted phenyl-lower alkoxy group, a substituted or unsubstituted phenyl-lower alkoxycarbonyl group,

a substituted or unsubstituted cycloalkenyl group (a cyclo- butenyl group, etc.), a substituted or unsubstituted bicyclic heterocyclic group. a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-0-, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO-, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO-lower alkyl group, and a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-lower alkyl group (substituents in the substituted lower cycloalkyl group portion, substituted phenyl group portion, substituted lower cycloalkenyl group portion, substituted bicyclic heterocyclic group portion or substituted monocyclic 5- or 6 -membered heterocyclic group portion are not particularly limited, and examples of which include a halogen atom (Cl, F, Br, etc.), cyano group, nitro group, oxo group and substituents in the substituents of Group C mentioned below, etc.

Also, a monocyclic 5- or 6-membered heterocyclic group portion includes a monocyclic 5- or 6-membered heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, and : specific examples include a piperidyl group, a piperazinyl group, a morpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidinyl group, a pyrrolyl group, an imid- azolyl group, a pyrazolyl group, a thiazolyl group, a thiadiazolyl group, a thienyl group, etc.

Also, a bicyclic heterocyclic group portion includes a bicyclic heterocyclic group containing 1 to 3 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising two 5- or 6-membered rings being fused, and examples of which include an isoindolinyl group, an - indolinyl group, etc.) ---Substituents group A' (particularly preferred substi- tuents of Group A) :---=---=<------

As more preferable substituents of Group A, the following substituents are mentioned: a halogen atom (Cl, etc.); cyano group; nitro group; oxo group; carbamoyl group; a lower alkyl group; a lower alkoxy group; a lower alkanoyl group; a lower alkoxycarbonyl group; a lower alkoxy-substituted lower alkyl group, a mono- or di-substituted amino group (a lower cycloalkyl- carbonyl-substituted amino group, etc.), a mono- or di-substituted carbamoyl group (a phenyl-substi- tuted carbamoyl group, etc.), a lower cycloalkyl-CO-, a substituted or unsubstituted phenyl group (phenyl group, a halophenyl group, etc.), a substituted or unsubstituted phenyl-lower alkyl group (a phenyl-lower alkyl group, a halophenyl-lower alkyl group, etc.), a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group (a thienyl group, etc.), a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-0- (a pyrimidinyloxy group, a halo- pyrimidinyloxy group, etc.), and a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO- (a pyridylcarbonyl group, a thienyl- h carbonyl group, etc.). (In the above description, each monocyclic 5- or 6-membered heterocyclic group portion includes a monocyclic 5- or 6- membered heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, and examples of which include a pyridyl group, a pyrimidin- yl group, a thienyl group, etc.)

------Substituents of Group J ’

As substituents of Group B, the following substituents are mentioned: a lower alkyl group; a lower alkoxy-substituted lower alkyl group; a lower alkoxycarbonyl-substituted lower alkyl group; a hydroxy lower alkyl group; a carboxy lower alkyl group; . ~ a substituted or unsubstituted lower cycloalkyl group, a substituted or unsubstituted lower cycloalkyl-lower alkyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted phenyl-lower alkyl group, a substituted or unsubstituted bicyclic hydrocarbon group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-lower alkyl group. and a substituted or unsubstituted bicyclic heterocyclic group- lower alkyl group (substituents in the substituted lower cycloalkyl group portion, substituted phenyl group portion, substituted bicyclic hydrocarbon group portion, substituted monocyclic 5- or 6-membered heterocyclic group portion or substituted bicyclic heterocyclic group portion are not particularly limited, and examples of which include substituents in the substituents of Group C mentioned below.

A bicyclic hydrocarbon group portion includes a bicyclic hydrocarbon group having 9 to 11 carbon atoms, and examples of which include an indanyl group, etc.

Also, a monocyclic 5- or 6-membered heterocyclic group portion includes a monocyclic 5- or 6-membered heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, and examples of which include a piperidyl group, a piperazinyl group, a morpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyrrolidinyl group, an imidazolidinyl" group, a pyrazolidinyl group, a pyrrolyl group, an imid- azolyl group, a pyrazolyl group, a thiazolyl group, a thiadiazolyl group, a thienyl group, etc.

Also, a bicyclic heterocyclic group portion includes a bicyclic heterocyclic group containing 1 to 3 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising two 5- or 6-membered rings being fused, and examples of which include a benzodioxolanyl group, etc.) . ------Substituents of Group B' (more preferred substituents of Group B):----~~r--=--=--=----

As more preferred substituents of Group B, the following substituents are mentioned: a lower alkyl group (methyl group, ethyl group, isopropyl group, butyl group, etc.), a lower cycloalkyl group, a lower alkoxy-substituted lower alkyl group, a pyrimidinyl group, a thiazolyl group, a thiadiazolyl group.

As particularly preferred substituents of Group B, the following substituents are exemplified:

Tn case that R? is a di-substituted amino group, a lower alkyl group (methyl group, ethyl group, isopropyl group, butyl group, etc.), a lower cycloalkyl group and a lower alkoxy-substituted lower alkyl group; and in case that R? is a mono-substituted amino group, a pyrimidinyl group, a thiazolyl group and a thiadiazolyl group. ------Substituents of Group C:-----=-=-=---=-=-~-=-~

As substituents of Group C, the following substi- tuents are mentioned: a lower alkyl group; a hydroxy-lower alkyl group; a lower alkanoyl group; a lower cycloalkylcarbonyl group; a lower alkoxy group; a lower alkoxycarbonyl group; a lower alkyl- sulfonyl group; a di-lower alkyl-substituted carbamoyl group; a di-lower alkylamino-substituted lower alkanoyl group; and a substituted or unsubstituted phenyl group, a substituted or unsubstituted phenyl-O-, a substituted or unsubstituted phenyl-CO-, a substituted or unsubstituted phenyl-lower alkanoyl group, a substituted or unsubstituted phenyl-lower alkyl group, a substituted or unsubstituted phenyl-lower alkoxy group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-0- (a pyridyloxy group, etc.), a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CcO- (a pyridylcarbonyl group, etc.), and a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-substituted amino group (a pyridylamino group, etc.) {substituents in the substituted phenyl group portion or substituted monocyclic 5- or 6-membered heterocyclic group portion are not particularly limited, and examples of which include a halogen atom (Cl, F, Br, etc.), cyano group, nitro group, 0x0 group, a lower alkyl group, a lower alkoxy group, a lower alkanoyl group, and a lower alkoxycarbonyl group, etc.

Also, a monocyclic 5- or 6-membered heterocyclic group portion includes a monocyclic 5- or 6-membered heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, and examples of which include a piperidyl group, a piperazinyl group, a morpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidinyl group, a pyrrolyl group, an imid- azolyl group, a pyrazolyl group, a thiazolyl group, a thiadiazolyl group, a thienyl group, etc.)

In the objective compound [I] of the present invention, as R? when X is -N(R))- or -0-, a cyclic group which may be substituted may be mentioned as a preferred example.

Also, in the objective compound [I] of the present invention, as R? when X is -CO-, there may be mentioned (1) a monocyclic, bicyclic or tricyclic nitrogen-containing heterocyclic group which may be substituted or {2) an amino group which may be substituted, represented by the formula:

ZN . \ N— as preferred examples.

Also, in the objective compound [I] of the present invention, among the two kinds of cis-trans isomers based on a cyclohexyl ring in the structure [IT] as a standard plane, a trans-isomeric compound is more preferred from the viewpoint of obtaining higher DPPIV inhibitory activity.

That is, among the objective compound [I] of the present invention, a compound having the following partial struc- ture: & re Of or a pharmaceutically acceptable salt thereof is preferred.

In particular, for a compound in which the group X is -CO-, superiority of such trans isomer is remarkable.

As one compound group of the compounds of the present invention, among the compounds [I], those in which R? is (1) a cyclic group which may have 1 to 3 substituents which are the same or different and selected from the substi- tuents of Group A, where the cyclic group portion is (i) a monocyclic, bicyclic or tricyclic hydrocarbon group, or (ii) a monocyclic, bicyclic or tricyclic heterocyclic group, or (2) an amino group having 1 or 2 substituents which are the same or different and selected from the substituents of

Group B can be mentioned. (Compound Group 1)

Also, as other compound groups, among the compounds [I] or the above-mentioned Compound Group 1, the compounds in which R? is (1) a cyclic group which may be substituted, where the cyclic group portion is selected from the following (i) to (iv) : "(i) a monocyclic hydrocarbon group having 3 to 7 carbon atoms, (ii) a bicyclic hydrocarbon groups having 9 to 11 carbon atoms, (iii) a monocyclic heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, and (iv) a bicyclic heterocyclic group containing 1 to 3 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising two 5- to 7-membered rings being fused; or (2) a substituted amino group; can be mentioned (Compound Group 2).

Also, among the above-mentioned Compound Group 2, the compounds in which R? is (1) a cyclic group which may be substituted wherein the cyclic group portion is a group selected from phenyl group, cyclohexyl group, cyclopentyl group, cyclo- butyl group, cyclopropyl group, an indanyl group, an indenyl group, a naphthyl group, tetrahydronaphthyl, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidin- yl group, an oxolanyl group, a thiolanyl group, a pyrrolin- yl group, an imidazolinyl group, a pyrazolinyl group, a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a triazolyl group, a tetrazolyl group, a furyl group, an oxazolyl group, an isoxazolyl group, an oxadiazolyl group, a thienyl group, a thiazolyl group, an isothiazolyl group, a thiadiazolyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyranyl group, a tetrahydropyridyl group, a dihydropyridazinyl group, a perhydroazepinyl group, a perhydrothiazepinyl group, an indolinyl group, an iso- 5° indolinyl group, an indolyl group, an indazolyl group, an isoindolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzoxazolyl group, a benzodioxolanyl group, a benzothienyl group, a benzofuryl group, a thienopyridyl group, a thiazolopyridyl group, a pyrrolopyridyl group, a dihydropyrrolopyridyl group, a quinolyl group, an iso- quinolyl group, a quinoxalinyl group, a quinazolinyl group, a phthalazinyl group, a cinnolinyl group, a chromanyl group, an isochromanyl group, a naphthyridinyl group and partially or completely saturated cyclic groups thereof; or (2) a substituted amino group can be mentioned (Compound

Group 3).

Also, in Compound Group 3, as more preferred compound group, the compounds in which R? is : (1) a cyclic group which may be substituted, where the cyclic group portion is a group selected from the group consisting of phenyl group, cyclohexyl group, a pyrrolidin- yl group, a tetrazolyl group, a furyl group, a thienyl group, a thiazolyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a perhydroazepinyl group, an indolinyl group, an isoindolinyl group, a benzothienyl group, a thienopyridyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group, a quinolyl group, an isoquinolyl group, a quinoxalinyl group and partially or completely saturated cyclic groups thereof; or (2) a substituted amino group can be mentioned (Compound

Group 4).

Also, in Compound Group 4, as more preferred compound group, the compounds in which R? is (1) a cyclic group which may be substituted wherein the cyclic group portion is a group selected from . a pyrrolidinyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, an indolinyl group, an isoindolinyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group and partially or completely saturated’ cyclic groups thereof; or ) " (2) a substituted amino group can be mentioned (Compound

Group 5).

Also, among the compounds [I], as another more pre- ferred compound group, the compounds in which R? is (1) a cyclic group which may have 1 to 3 substituents, which are the same or different, selected from the substituents of Group A', where the cyclic group portion is selected from the group consisting of a pyrrolidinyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group. a pyridyl group, a pyrimidinyl group, an indolinyl group, an isoindolinyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group and partially or completely saturated cyclic groups thereof; or (2) an amino group substituted by 1 or 2 substituents, which are the same or different, selected from the substi- tuents of Group B' can be mentioned. (Compound Group 6)

Also, among the compounds [I], or among each of the . above-mentioned Compound Groups 1, 2, 3, 4, 5 and 6, a compound group in which, when X is -N(R}) - or -0-, R? is a cyclic group which may be substituted can be mentioned. (Compound Group 7)

Also, among the compounds [I], or among each of the above-mentioned Compound Groups 1, 2, 3, 4, 5 and 6, a group of compounds in which, when X is -CO-, R? is (1) a monocyclic, bicyclic or tricyclic nitrogen-containing heterocyclic group which may be substituted or (2) an amino group which may be substituted, represented by the formula:

NT can be mentioned. (Compound Group 8)

Also, among the compounds [I] or the above-mentioned } Compound Groups 1, 2, 3, 4, 5, 6, 7 or 8, as more preferred compound groups, a compound group in which X is -CO- or -0- and A is -CHj-; a compound group in which X is -CO- or -O-, A is -CH;- and

R! is hydrogen atom; a compound group in which X is -CO-, A is -CH;- and R' is hydrogen atom; a compound group in which X is -CO-, A is -CH;-, R! is hydrogen atom and R? is a cyclic group which may be substi- tuted; a compound group in which X is -CO-, A is -CHz-, R' is hydrogen atom and R? is a substituted amino group; a compound group in which X is -CO- or -O- and A is -S-; - a group of compounds in which X is -CO- or -0-, A is -S- and R' is hydrogen atom; a compound group in which X is -CO-, A is -S- and R! is hydrogen atom; a compound group in which X is -CO-, A is -S-, R! is hydro- gen atom and R? is a cyclic group which may be substituted; a compound group in which X is -CcO-, A is -S-, R' is hydro- gen atom and R? is a substituted amino group, etc. may be mentioned.

Also, in each of the above-mentioned compound groups, . as a more preferred compound group, a compound group having the following partial structure:

R1 —xnd Hp can be mentioned.

Also, among the compounds [I], the following com- pounds can be mentioned as examples of preferred compounds;

(S)-2-cyanoc-1-[trans-4-(5-nitro-2-pyridylamino) - cyclohexylamino]acetylpyrrolidine; (8S) -2-cyano-1-[trans-4-(5-cyano-2-pyridyloxy) - cyclohexylaminolacetylpyrrolidine; (S) -2-cyano-1-[trans-4- (dimethylaminocarhonyl) - cyclohexylamino]acetylpyrrolidine; (S) -2-cyano-1-[trans-4- (morpholinocarbonyl)cyclo- hexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-{5-bromo-2-pyrimidinyloxy) - cyclohexylamino] acetylpyrrolidine; (S)-2-cyano-1-[trans-4- (5-pyrimidinylaminoccarbonyl) - cyclohexylamino] acetylpyrrolidine; (S) -2-cyano-1-[trans-4-{(N-ethyl-N-methoxyethylamino- carbonyl) cyclohexylaminol]acetylpyrrolidine; (S)-2-cyano-1-[trans-4- (N-ethyl-N-isopropylamino- carbonyl) cyclohexylaminolacetylpyrrolidine; (Ss) -2-cyano-1-[trans-4- (N-methyl-N-butylamino- carbonyl) cyclohexylamino]acetylpyrrolidine; (S) -2-cyano-1-[trans-4-[(S)-2-methoxymethylpyrroli- din-1l-ylcarbonyl] cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(3-carbamoylpiperidinocarbon- vl) cyclohexylamino]acetylpyrrolidine; (S) -2-cyano-1-[trans-4-{(3-nitro-2-pyridylamino)cyclo- hexylamino]acetylpyrrolidine; (S) -2-cyano-1-[trans-4-(4-acetylpiperazin-1-ylcarbon- vl) cyclohexylamino]acetylpyrrolidine; } (S) -2-cyano-1- [trans-4- (2-isoindolinylcarbonyl)cyclo- hexylamino] acetylpyrrolidine; (S) -2-cyano-1-[trans-4-[4-(3-pyridylcarbonyl)pipera- zin-1l-ylcarbonyl]cyclohexylamino]acetylpyrrolidine; (8) -2-cyano-1-{trans-4-[4-(3-thenoyl)piperazin-1-yl- carbonyl] cyclohexylamino}lacetylpyrrolidine; (8) -2-cyano-1-{trans-4-{4-{(4-chlorophenyl)piperazin- 1-ylcarbonyl]cyclohexylaminolacetylpyrrolidine; (§) -2-cyano-1-[trans-4-{cis-2,6-dimethylmorpholino- carbonyl) cyclochexylamino]acetylpyrrolidine;

(S)-2-cyano-1-[trans-4-(5-nitro-2-isoindolinyl- carbonyl) cyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1l-{trans-4-{(piperidinocarbonyl)cyclo- hexylamino]acetylpyrrolidine; (S)-2-cyano-1-({trans-4-(4-carbamoylpiperidinocarbon- yl) cyclohexylamino] acetylpyrrolidine; Co (S)-2-cyano-1-[trans-4-(1l-pyrrolidinylcarbonyl) - . cyclohexylamino] acetylpyrrolidine; N (S)-2-cyano-1-[trans-4-(4-cyclopropylcarbonyl- priperazin-1-ylcarbonyl)cyclohexylamino]lacetylpyrrolidine; (S)-2-cyano-1-[trans-4- (4 -propionylpiperazin-1-yl- carbonyl) cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(1l-indolinylcarbonyl)cyclo- hexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(2,3-dihydro-1H-pyrrolo(3,4- blpyridin-2-ylcarbonyl)cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-[4-(2-pyrimidinyloxy) - piperidinocarbonyll cyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1-{trans-4-[4-(5-bromo-2-pyrimidinyloxy) - piperidinocarbonyllcyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1-[trans-4-{(cis-3,5-dimethyl-4-benzyl- piperazin-1-ylcarbonyl)cyclohexylamino] acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(4-cyclohexylcarbonylamino- piperidinocarbonyl) cyclohexylamino] acetylpyrrolidine; (S)-2-cyano-1-{trans-4-[4- (N-phenylcarbamoyl) - piperazin-l-ylcarbonyl]lcyclohexylamino}lacetylpyrrolidine; } (S) -2-cyano-1-[trans-4- (4-ethoxycarbonylpiperazin-1- ylcarbonyl) cyclohexylaminol acetylpyrrolidine; (S)-2-cyano-1-{trans-4-[4- (2-thienyl)piperidino- carbonyl] cyclohexylamino}acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(1,1-dioxoperhydro-1,4-thia- zin-4-ylcarbonyl)cyclohexylamino]acetylpyrrolidine; (R) -4-cyano-3-[trans-4-(5-nitro-2-pyridylamino)cyclo- hexylamino]acetylthiazolidine; (R) -4-cyano-3-[trans-4-(5-cyano-2-pyridyloxy)cyclo- hexylamino]acetylthiazolidine;

(R) -4-cyano-3- [trans-4- (dimethylaminocarbonyl)cyclo- hexylamino]acetylthiazolidine; (R) -4-cyano-3- [trans-4- (2-isoindolinylcarbonyl)cyclo- hexylamino]acetylthiazolidine; (R) -4-cyano-3- [trans-4- {(morpholinocarbonyl)cyclo- hexylamino]acetylthiazolidine; and (R) -4-cyano-3- [trans-4- (pyrrolidinylcarbonyl)cyclo- hexylaminol]acetylthiazolidine.

The objective compound [I] or a pharmaceutically acceptable salt thereof of the present invention has superior inhibitory action on the enzyme activity of DPPIV.

They have superior inhibitory action especially on human

DPPIV. In addition, they also exhibit high selectivity with respect to DPPIV (namely, type IV dipeptidylpeptidase) in various serine proteases (e.g., plasmin, thrombin, prolylendopeptidase, trypsin and dipeptidylpeptidase II). :

Also, the objective compound [I] or a pharmaceuti- cally acceptable salt thereof of the present invention improves insulin secretion response to oral glucose loading by means of its DPPIV inhibitory action.

Thus, the objective compound [I] or a pharmaceuti- cally acceptable salt thereof of the present invention is useful as prophylactic or therapeutic agents for diseases relating to DPPIV (diseases mediated by DPPIV), that is, diseases which is expected to be alleviated by inhibiting

DPPIV enzyme activity.

Examples of such diseases include diabetes (e.g., -

N : type 1 diabetes and type 2 diabetes), hyperglycemia (such as postprandial hyperglycemia), hyperinsulinemia, diabetes complications (such as renal disorder and neurological : disorder), obesity, overeating, lipid metabolism disorder (such as hyperlipemia including hypertriglyceridemia and others), autoimmune diseases (such as arthritis and rheumatoid arthritis), osteoporosis, acquired immunodefi- ciency syndrome (AIDS) and rejection of transplanted organs and tissues.

The objective compound [I] or a pharmaceutically acceptable salt thereof of the present invention is parti- cularly useful as a prophylactic or therapeutic agent of diabetes (and particularly type 2 diabetes).

Also, the compound of the present invention has low toxicity, and thus, has a high degree of safety when used as a pharmaceutical compound. Also, it also demonstrates superior pharmacokinetic characteristics [including bio- availability, in vitro metabolic stability (stability in human liver homogenates), P450 inhibitory action, protein binding capabilities, etc.].

The DPPIV inhibitory action of the compound of the present invention as well as its pharmaceutical efficacy (including anti-hyperglycemia effect and the effect of improving insulin secretion response to glucose loading) based on that action can be confirmed by known methods or methods equivalent to those methods (W098/19998; W000/ 34241; Holst, et al., Diabetes, Vol. 47, pp. 1663-1670, 1998; Augustyns, et al., Current Medicinal Chemistry, Vol. 6, pp. 311-327, 1999; Meester, et al., Immunol. Today, Vol. 20, pp. 367-375, 1999; and, Fleicher, et al., Immunol.

Today, Vol. 15, pp. 180-184, 1994).

The objective compound [I] of the present invention can be used for a pharmaceutical use either in a free form or in a form of a pharmaceutically acceptable salt.

Examples of the pharmaceutically acceptable salt of the compound [I] include an inorganic acid salt such as hydro- : chloride, sulfate, phosphate or hydrobromide, and an organic acid salt such as acetate, fumarate, oxalate, : citrate, methanesulfonate, benzenesulfonate, tosylate or maleate, etc. In addition, in case that a compound has a substituent (s) such as carboxyl group, a salt with a base (for example, an alkali metal salt such as a sodium salt, a potassium salt, etc., or an alkaline earth metal salt such as a calcium salt and the like) may be mentioned.

The objective compound [I] or a pharmaceutically acceptable salt thereof of the present invention includes its internal salt, an adduct, a solvate and a hydrate.

The objective compound [I] or a pharmaceutically acceptable salt thereof of the present invention can be administered orally or parenterally and used as commonly ., used pharmaceutical preparations such as a tablet, granule, capsule, powder, injection solution and inhalant. For example, the compound of the present invention can be used with an excipient or a diluent acceptable for general pharmaceuticals such as a binder, disintegrator, extender, filler and lubricant, to form a preparation according to the usual method.

The administration dose of the objective compound [I] or a pharmaceutically acceptable salt thereof of the present invention may vary depending on the administration method, age, weight and condition of a patient, and it is generally about 0.01 to 300 mg/kg, particularly preferably about 0.1 to 30 mg/kg per day.

The objective compound [I] of the present invention can be prepared according to the following (Process A) and (Process B), but it is not limited to these processes. (Process A)

The objective compound [I] of the present invention can be prepared by reacting a compound represented by the formula [II]:

Z'—CHp-CO-N" DA )— [11]

CN - wherein 2! represents a reactive residue and A has the same meaning as defined above, with a compound represented by the formula [III]:

R! rex Yon, [111]

wherein R!, R? and X have the same meanings as defined above, or a salt thereof, and optionally, by making the product into a pharmaceutically acceptable salt.

As examples of the salt of the compound [III], a salt with an inorganic acid such as hydrochloride and sulfate, : or a salt with an inorganic base such as an alkali metal salt and an alkaline earth metal salt can be used.

As the reactive residue of z', commonly used reactive residues such as a halogen atom, a lower alkylsulfonyloxy group and an arylsulfonyloxy group can be used, among which the halogen atom is particularly preferred.

The reaction of the compound [II] with the compound [III] or the salt thereof can be carried out in a suitable solvent or without solvent in the presence or absence of an acid acceptor.

As the solvent, any solvents may be suitable as long as it does not adversely affect to the reaction, and, for example, acetonitrile, methanol, ethanol, isopropyl alcohol, propyl alcohol, acetone, dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, ether, dioxane, ethyl acetate, toluene, methylene chloride, dichloroethane, chloroform or a mixed solvent of these solvents can be suitably used.

This reaction suitably proceeds at 0 to 120°C, par- ticularly at room temperature to 80°C.

As the acid acceptor, an inorganic base (for example, alkali metal hydride such as sodium hydride, alkali metal carbonate such as sodium carbonate and potassium carbonate, ) " alkali metal alkoxide such as sodium methoxide, alkali metal such as sodium, and alkali metal hydroxide such as sodium hydroxide and potassium hydroxide, etc.) or an organic base (for example, triethylamine, diisopropyl- ethylamine, N-methylmorpholine, pyridine, dimethylaniline, dimethylaminopyridine, etc.) can be suitably used. (Process B)

In addition, among the objective compound [I] of the present invention, the compound represented by the formula [I-a]:

R! -co~ Ynr-crp-co—y a T-al

CN wherein R?! represents (1) a monocyclic, bicyclic or tricyclic nitrogen-containing heterocyclic group which may be substituted or (2) an amino group which may be substituted, and represented by the formula: t N— 4 and R! and A have the same meanings as defined above, can be prepared by reacting a compound represented by the formula [IV]:

R

VN

HOOC N—CH2-CO-N" “A Iv]

R4

CN wherein R! represents a protective group for an amino group, and R! and A have the same meanings as defined above, or a salt thereof with the compound represented by the formula [V]: : R2!-H C- : or a salt thereof to obtain a compound represented by the formula [VI]:

R? 21 EN

R co Yon—onz-c0— A [VI]

La \—/

CN wherein R', R!, R?! and A have the same meanings as defined above, or a salt thereof, and by removing the protective group for the amino group (RY) from the product, and optionally, by . 5 making the product into a pharmaceutically acceptable salt.

As examples of salts of the compounds [IV] to [VI], a salt with an inorganic acid such as hydrochloride and sulfate, or a salt with an inorganic base such as an alkali metal salt and an alkaline earth metal salt can be used.

As the protective group for the amino group of RY, any of the commonly used protective groups for the amino group such as t-butoxycarbonyl group, benzyloxycarbonyl group, trifluoroacetyl group, chloroacetyl group, 9- fluorenylmethyloxycarbonyl group, etc. can be suitably used.

The reaction of the compound [IV] or a salt thereof with the compound [V] or a salt thereof can be carried out in a suitable solvent or without solvent in the presence or absence of a condensing agent.

As the solvent, any solvents may be suitable as long as it does not adversely affect to the reaction, and, for example, acetonitrile, methanol, ethanol, isopropyl alcohol, propyl alcohol, acetone, dimethylformamide, tetrahydrofuran, ether, dioxane, ethyl acetate, toluene, methylene chloride, dichloroethane, chloroform or a mixed solvent of these solvents can be suitably used. oo This reaction suitably proceeds at 0 to 120°C, parti- cularly at room temperature to 80°C.

For the condensing agent, O-benzotriazol-1-yl-

N,N,N',N'-tetramethyluroniumhexafluorophosphate, DCC {dicyclohexylcarbodiimide), EDC (l-ethyl-3-(3-dimethyl- aminopropyl) carbodiimide), chloroformates (for example, ethyl chloroformate and isobutyl chloroformate) and carbonyldiimidazole can be suitably used.

Also, for promoting the reaction, additives such as base (sodium carbonate, sodium hydrogencarbonate, tri- ethylamine, pyridine, 4-dimethylaminopyridine, diisopropyl-

ethylamine, 1,8-diazabicyclo(5.4.0]Jundec-7-ene, etc.), 1- } hydroxybenzotriazole, 1l-hydroxysuccinimide, etc. can be added to the above condensing agents.

The subsequent removal of the protective group (RY) for the amino group of the compound [VI] can be carried out according to the conventional method, and it can be carried out, for example, in a suitable solvent or without solvent by an acid treatment, base treatment or catalytic reduction.

As the solvent, any solvents may be suitable as long as it does not adversely affect to the reaction, and, for example, methanol, ethanol, isopropyl alcohol, propyl alcohol, dioxane, methylene chloride, chloroform, dichloro- ethane, ether, tetrahydrofuran, ethyl acetate, toluene or a mixed solvent of these solvents can be suitably used.

This reaction suitably proceeds at -78 to 80°C, particularly at 0°C to room temperature.

As the acid, an inorganic acid such as hydrochloric acid, sulfuric acid, etc., and an organic acid such as acetic acid, trifluoroacetic acid, methanesulfonic acid, p- toluenesulfonic acid, etc. can be suitably used.

As the base, an inorganic base (for example, alkali metal hydride such as sodium hydride, etc., alkali metal carbonate such as sodium carbonate, potassium carbonate, etc., alkali metal alkoxide such as sodium methoxide, etc., alkali metal such as sodium, etc., and alkali metal } hydroxide such as sodium hydroxide, potassium hydroxide, etc.) or an organic base (for example, triethylamine, diisopropylethylamine, morpholine, N-methylmorpholine, pyridine, piperidine, dimethylaniline, dimethylamino- pyridine, etc.) can be suitably used.

The catalytic reduction can be carried out by suit- ably using palladium-carbon, palladium hydroxide-carbon, platinum oxide or Raney nickel under hydrogen atmosphere.

The starting material [II] of the present invention can be prepared, for example, according to the method described in International Patent Publications Nos. WO

: 98/19998, WO 00/34241, Reference Examples (Reference

Example 1 or 2) mentioned below and the like.

For example, the compound [II] can be obtained by reacting a compound represented by the formula [10]:

HN OA . / [10] i CONH; wherein A has the same meaning as defined above, with a compound represented by the formula [11]: z?-CH,Cc0-2? [11] wherein Zz? and 2’ represent reactive residues which may be the same or different, in the presence of an acid acceptor (for example, triethyl- amine) to obtain a compound represented by the formula

[12]: 72-CHp-CO-N" A

VJ [12]

CONH, wherein Z2 and A have the same meanings as defined above, and treating the product with a dehydrating agent (for example, phosphorous oxychloride, trifluoroacetic anhydride, etc.) according to the conventional method.

As the reactive residue of Zz? or Zz’, the same reactive residue commonly used as in the above 7' can be suitably used.

The starting material [III] can be prepared, for example, by the same method as described in Reference

Examples (Reference Examples 3 to 14) mentioned below.

For example, the compound [III] in which X is -N(R?)- or -0O- can be prepared by reacting a compound represented by the formula [13]:

R - fw wherein Vv! represents -NH(R®) - or hydroxy group, and

R' and R® have the same meanings as defined above, an amino group-protected material thereof or a salt thereof with a compound represented by the formula [14]:

R%-z* [14] wherein 2! represents a reactive residue and R? has the same meaning as defined above, in the presence or absence of an acid acceptor (for example, an organic base such as triethylamine, diisopropylethyl- amine, etc., and an inorganic base such as sodium hydride, potassium carbonate, etc.), and, if necessary, by removing the protective group for the amino group according to the conventional method.

As the protective group for the amino group, any of the same protective groups commonly used as in the above R* can be suitably used.

As the reactive residue of z%, the same reactive residues commonly used as in the above z! can be suitably used.

For example, the compound [III] in which X is -CO- and R? is a group represented by the formula: . ZN { N—

N._..” . . : can be produced by reacting a compound represented by the formula [15]:

R! wherein V? represents -COOH and R! has the same meaning as defined above,

an amino group-protected material thereof or a salt thereof with a compound represented by the formula [16]:

R**-H [16] wherein R?? represents (1) a monocyclic, bicyclic or tricyclic nitrogen-containing heterocyclic group which may be substituted or (2) an amino group which may be substituted, represented by the formula: as \_/ and forms a cyclic or straight amine together with hydrogen atom, or a salt thereof, in the presence of a condensing agent {({l-ethyl-3-(3-dimethylaminopropyl) carbodiimide, etc.) and, if necessary, by removing the protective group for the amino group according to the conventional method.

Or else, the compound [III] in which X is -CO- can be obtained by reacting a compound represented by the formula

[17]:

R! zoe Yon, [17] wherein Z° represents a reactive residue and R! has the same meaning as defined above, an amino group-protected material thereof or a salt thereof with a compound represented by the formula [18]:

R*-sSn(R®), [18] wherein R® represents a lower alkyl group and R? has the same meaning as defined above, in the presence of a palladium catalyst (for example, dichlorobis{triphenylphosphine)palladium, etc.).

As the protective group for the amino group, any of the same protective groups commonly used as in the above

R* can be suitably used. Also, as the reactive residue of 73, the same reactive residues commonly used as in the above 2! can be suitably used.

Or else, the compound [III] in which X is -N(R’)- can be prepared by reacting the compound represented by the formula [19]: a a. R' o=( Yorn, [19] wherein R! has the same meaning as defined above, an amino group-protected material thereof or a salt thereof with the compound represented by the formula [20]:

R*-V’ [20] wherein V® represents -N(R*)H and R? has the same meaning as defined above, in the presence of a reducing agent (sodium triacetoxyboro- hydride, etc.) and, if necessary, by removing the protec- tive group for the amino group according to the conven- tional method.

The starting materials [10] to [20] can be prepared according to known methods or in the same manner as described in Reference Examples mentioned below.

In order to obtain a trans form of the starting material [III] taking a cyclohexane ring as a standard plane, each trans form of the starting cyclohexane compounds (the compounds [13], [15], [17], etc.) may be used. -

Also, the starting material [IV] can be prepared, for example, in the same manner as in the process described in

Example (Example 3-1, (1) to (3)) mentioned below or in accordance with these processes, as shown in the following figure. (In the figure, 7 represents a reactive residue,

R! represents a protective group for an amino group and other symbols have the same meanings as defined above.)

As the reactive residue of Zz°, the same reactive residues commonly used as in the above Z' can be suitably used. 0]

R! Ay

NH, R' bo; R' R* 0

HAC Ne HOF Sop NC Some

CO LL ° a J, 0 (1) HC X 2) H.C? NC

O .

R i Q

Fe 4

HO NC

Oo [Compound IV]

The compound [I] of the present invention or its starting material prepared according to the above is iso- lated in a free form or as a salt thereof, and purified.

The salt can be prepared by subjecting to the salt-forming treatment conventionally used.

Isolation and purification can be carried out by applying the usual chemical operations such as extraction, concentration, crystallization, filtration, recrystalliza- tion, various kinds of chromatographies and the like.

In the compound of the present invention, optical isomers such as racemic isomers, optically active isomers, diastereomers, etc. can be present alone or as mixtures thereof. A stereochemically pure isomer can be derived by using a stereochemically pure starting material or by ’ separating an optical isomer according to the general separation process for racemic resolution. Also, dias- tereomeric mixtures can be separated according to the conventional method, for example, fractional crystalliza- tion or by chromatography.

EXAMPLES

The present invention will be described in detail by referring to the following Examples but these Examples do not intend to limit the present invention.

Example la-1

A acetonitrile-methanol solution containing 100 mg of (S) -1-bromoacetyl-2-cyanopyrrolidine (Reference Example 1 mentioned below) and 327 mg of N-(5-nitro-2-pyridyl) -trans- 1,4-cyclohexanediamine (Reference Example 3-1 mentioned below) was stirred at room temperature for 15 hours. Water was added to the reaction mixture and the mixture was extracted with chloroform. After the extract was dried io over sodium sulfate, the solvent was removed under reduced pressure. The residue was purified by dicl column chromatography (solvent: 0 to 10% methanol-chloroform) to obtain an oily product. The oily product was dissolved in 0.5 ml of ethyl acetate-0.5 ml of chloroform, and then, 1.0 ml of 2N hydrochloric acid-ether and 2 ml of ether were successively added thereto. Precipitates were collected by filtration and washed with ether to obtain (S)-2-cyano-1- [trans-4- (5-nitro-2-pyridylamino)cyclohexylamino]acetyl- pyrrolidine dihydrochloride (Example la-1 in Table 1a).

Examples la-2 to 1d-152

Using (S) -1-bromoacetyl-2-cyanopyrrolidine and corresponding starting materials, they were treated in the same manner as in Example la-1, compounds of Tables la to 1d shown below (Examples la-2 to la-89, 1b-1 to 1b-71, 1lc-1 to 1c-52 and 1d-1 to 152) were obtained. Incidentally, the corresponding starting materials were obtained by the similar method as described in Reference Examples mentioned below, by known methods or by a method in combination of - these methods.

Provided that the compound of Example 14-77 was obtained by using trans-4-(l-piperazinylcarbonyl)cyclo- hexylamine as a starting material.

Also, the compound of Example 1c-39 (namely, (8)-2- cyano-1-{trans-4-[(N-carboxymethyl-N-methylamino) carbonyl] - cyclohexylamino}lacetylpyrrolidine hydrochloride) was obtained by treating the compound of Example 1c-38 (namely,

(S)-2-cyano-1-{trans-4-[(N-tert-butoxycarbonylmethyl-N- methylamino)carbonyllcyclohexylaminolacetylpyrrolidine) with trifluoroacetic acid, followed by treating with hydrochloric acid.

Also, the compound of the Example 1d-14 (namely, (S)- 2-cyano-1-[trans-4- (l-piperazinylcarbonyl)cyclohexylamino] - acetylpyrrolidine-dihydrochloride) was obtained by treating a free form of the compound of Example 14-70 ((S)-2-cyano- 1- [trans-4- (4-benzyloxycarbonyl-1-piperazinylcarbon- yl) cyclohexylamino] acetylpyrrolidine) with trimethylsilyl iodide.

Examples 2-1 and 2-2 (1) A mixture of 600 mg of 4-tert-butoxycarbonylamino-4- methylcyclohexanone (the compound of Reference Example 6-1, (3)), 783 mg of sodium triacetoxyborohydride, 343 mg of 3- cyancaniline, 159 mg of acetic acid and 6 ml of dichloro- ethane was stirred at room temperature for 16 hours. The mixture was diluted with an aqueous saturated sodium hydro- gencarbonate solution and then extracted with chloroform.

The extract was dried over anhydrous sodium sulfate and the solvent was removed under reduced pressure. The residue was purified by silica gel column chromatography (solvent: hexane-ethyl acetate (4:1) to (1:1)) to obtain 304 mg of N- tert-butoxycarbonyl-1l-methyl-c-4- (3-cyano-phenylamino) -r-1- cyclohexylamine and 292 mg of N-tert-butoxycarbonyl-1- methyl-t-4- (3-cyano-phenylamino) -r-1-cyclohexylamine. . . (2) 243 mg of N-tert-butoxycarbonyl-1l-methyl-c-4-(3-cyano- phenylamino) -r-1-cyclohexylamine obtained in the above (1) was stirred in a mixture of 2 ml of 4N hydrochloric acid/ dioxane and 2 ml of ethanol at room temperature for 15 hours.

After the reaction mixture was concentrated, to the residue were added 320 mg of (S)-l-bromoacetyl-2-cyano- pyrrolidine, 0.6 ml of triethylamine, 3.5 ml of aceto- nitrile and 1 ml of methanol and the mixture was stirred at room temperature for 15 hours. The mixture was diluted with an aqueous saturated sodium hydrogencarbonate solution and extracted with chloroform. The extract was dried over anhydrous sodium sulfate and the solvent was removed under reduced pressure. The residue was purified by silica gel column chromatography (solvent: chloroform-methanol (50:1)) to obtain 154 mg of the compound, which was then treated with hydrochloric acid to yield (S)-2-cyano-1l-[l-methyl-c- 4-(3-cyano-phenylamino) -r-1-cyclohexylamino]acetylpyrroli- dine-dihydrochloride (Table 2: Example 2-1). (3) Using N-tert-butoxycarbonyl-1l-methyl-t-4-(3-cyano- phenylamino) -r-1-cyclohexylamine obtained in the above (1), it was treated in the same manner as in (2), (S8)-2-cyano-1l- [1-methyl-c-4- (3-cyano-phenylamino) -r-1-cyclohexylamino} - acetylpyrrolidine-dihydrochloride (Example 2-2 in Table 2) was obtained.

Examples 2-3 to 2-8

Using corresponding starting materials, they were treated in the same manner as in Examples 2-1 to 2-2, compounds of Examples 2-3 to 2-8 shown in Table 2 were obtained.

Example 3-1

PA

Clk She Chr HO oD

N ha NC ~~ ™ NC :

Oo @ o

Example 3-1 (1) In water was dissolved 5.0 g of trans-4-ethoxycarbonyl - cyclohexylamine dihydrochloride, and after the solution was made basic by adding potassium carbonate, the solution was extracted with chloroform. The extract was washed with brine, dried over anhydrous sodium sulfate, and the solvent was removed under reduced pressure.

A mixture of the residue, 5.1 g of p-toluensulfonic acid monohydrate and 50 ml of allyl alcohol was refluxed for 48 hours.

The reaction mixture was concentrated, and then, diluted with chloroform.

The chloroform solution was washed with an aqueous potassium carbonate solution, water and brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure.

The residue was purified by silica gel flash column chromatography (solvent: chloroform-methanol-

aqueous ammonia (500:10:1)) to obtain 3.29 g of trans-4-(2- propenyloxycarbonyl) cyclohexylamine.

(2) A mixture of 507 mg of the compound obtained in the above (1), 400 mg of (S)-1-bromoacetyl-2-cyanopyrrolidine, 714 mg of N,N-diisopropylethylamine and 4 ml of aceto-

nitrile was stirred at 50°C for 12 hours.

After cooling to room temperature, 476 mg of N,N-diisopropylethylamine, followed by 4 ml of acetonitrile solution containing 803 mg of di-tert-butyldicarbonate were added to the reaction mixture, and the mixture was stirred at room temperature for 3 hours.

After the reaction mixture was concentrated, the concentrate was diluted with ethyl acetate.

The ethyl acetate solution was washed with an aqueous 10% citric acid sclution, water and brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure.

The residue was purified by silica gel flash chromatography (solvent: chloroform-methanol (100:1)) to obtain 658 mg of (S) -2-cyano-1- [N-tert-butoxycarbonyl-trans-4- (2-propenyl- oxycarbonyl)cyclohexylaminolacetylpyrrolidine.

: (3) A mixture of 600 mg of the compound obtained in the above (2), 165 mg of tetrakis(triphenylphosphine)palladium, 271 mg of ammonium formate and 6 ml of dioxane was stirred at 50°C for 1 hour.

After cooling, the reaction mixture was poured into water and extracted with chloroform.

The extract was washed with brine, dried over anhydrous sodium sulfate, and then, the solvent was removed under reduced pressure.

The residue was purified by silica gel flash chromatography (solvent: chloroform-methanol (50:1)) to obtain 394 mg of (S)-2-cyano-1-(N-tert-butoxycarbonyl- trans-4-carboxycyclohexylamino)acetylpyrrolidine. (4) A solution of 2 ml N,N-dimethylformamide containing 150 mg of the compound obtained in the above (3), 64 mg of 2- aminomethylpyridine, 114 mg of l-ethyl-3-(3-dimethylamino- _ propyl) -carbodiimide and 80 mg of 1-hydroxybenzotriazole oo was stirred at room temperature for 24 hours. An agueous saturated sodium hydrogencarbonate solution was added to the reaction mixture and the mixture was extracted with chloroform. The extract was washed with brine and dried over anhydrous sodium sulfate and the solvent was removed under reduced pressure. The residue was dissolved in 3 ml of acetonitrile, and 1 ml of an acetonitrile solution of 118 mg of trimethylsilyl iodide was added dropwise to the solution under ice-cooling, and the mixture was stirred at room temperature for 30 minutes. To the reaction mixture were added methanol and water, and after stirring for a while, the mixture was neutralized with an aqueous saturated sodium hydrogencarbonate solution, and then, extracted with chloroform. The extract was washed with an aqueous saturated sodium hydrogencarbonate solution, water and brine, dried over anhydrous sodium sulfate, and then, the solvent was removed under reduced pressure. The residue was purified by diol chromatography (solvent: chloroform) to obtain an oily product. The oily product was dissolved in 1 ml of ethyl acetate, and then, 0.5 ml of iN hydrochloric acid-ether followed by 2 ml of ether were added thereto, and precipitates were washed with ether to obtain 106 mg of (S)-2-cyano-1-[trans-4-(2- ) pyridylmethylaminocarbonyl)cyclo- hexylamino] acetylpyrrolidine-dihydrochloride (Example 3-1 in Table 3).

Examples 3-2 to 3-12

The compounds of Examples 3-2 to 3-12 in Table 3 were obtained in the same manner as in Example 3-1 (4), using

(S) -2-cyano-1- (N-tert-butoxycarbonyl-trans-4-carboxycyclo- hexylamino)acetylpyrrolidine (the compound of the above

Example 3-1 (3)) and the corresponding starting materials.

Examples 4-1 to 4-32

A solution of 2 ml of acetonitrile-1 ml of methanol containing 100 mg of (R) -3-chloroacetyl-4-cyanothiazolidine (the compound of Reference Example 2 mentioned below) and 372 mg of N-(5-nitro-2-pyridyl)-trans-1,4-cyclohexane- diamine was stirred at room temperature for 15 hours.

Water was added to the reaction mixture and the mixture was extracted with chloroform. After the extract was dried over anhydrous sodium sulfate, the solvent was removed under reduced pressure. The residue was purified by diol column chromatography (solvent: 0 to 5% methancl-chloro- form) to obtain an oily product. The oily product was dissolved in 0.5 ml of ethyl acetate-0.5 ml of chloroform, and 1.0 ml of 2N hydrochloric acid-ether was added thereto, followed by 2 ml of ether. Precipitates were collected by filtration and washed with ether to obtain 173 mg of (R)-4- cyano-3-[trans-4-(5-nitro-2-pyridylamino)cyclohexylamino] - acetylthiazolidine dihydrochloride (Example 4-1 in Table 4).

Also, the compounds of Examples 4-2 to 4-32 in Table 4 were obtained in the same manner as mentioned above, using the corresponding starting materials.

Reference Example 1

N According to the process described in the literature (Ww0 $8/19998), (S) -1-bromoacetyl-2-cyanopyrrolidine was obtained by reacting L-prolineamide (commercially available product) and bromoacetyl bromide, followed by dehydration.

Reference Example 2

L-thioprolineamide hydrochloride was synthesized according to the process described in the literature (Ashworth et. al., Bioorg. Med. Chem. Lett., Vol. 6, pp. 2745-2748, 1996). 2.36 ml of chloroacetyl chloride was added to a solution of 150 ml of dichloromethane containing 5.00 g of L-thioprolineamide hydrochloride thus obtained and 8.67 ml of triethylamine under ice-cooling, and the mixture was stirred at the same temperature for 1 hour. To the reaction mixture was added a dichloromethane solution - containing 4.8 ml of pyridine and 8.4 ml of trifluoroacetic anhydride, and the mixture was further stirred at room temperature for 1 hour. The reaction mixture was washed with an aqueous 10% HCl solution and water, dried over anhydrous magnesium sulfate, filtered and concentrated

Co "uhder reduced pressure, and subsequently, the residue was crystallized from ether to obtain 4.82 g of (R)-3-chloro- acetyl-4-cyanothiazolidine as yellow-brownish crystals.

Reference Examples 3-1 to 3-40

A solution of 5-nitro-2-chloropyridine (2.50 g) and trans-1,4-cyclohexanediamine (5.40 g) in ethanol (15 ml) - tetrahydrofuran (10 ml) was stirred at room temperature for 5 days. The precipitates were removed by filtration and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (solvent: chloroform-methanol-concentrated aqueous ammonia (20:4:1)) and crystallized from ethyl acetate to obtain N- (5-nitro-2-pyridyl) -trans-1,4-cyclohexanediamine (Reference

Example 3-1 in Table 5).

Also, the compounds of Examples 3-2 to 3-40 in Table : 5 were obtained in the same manner as mentioned above, using the corresponding starting materials.

Reference Examples 3-41 to 3-44 } ] A N,N-dimethylacetamide (30 ml) solution containing 4-nitrofluorobenzene (1.69 g) and trans-1,4-cyclohexane- diamine (4.1 g) was stirred at 144°C for 3 days. After = cooling, an aqueous saturated potassium carbonate solution was added to the reaction solution, and the reaction mixture was extracted with ethyl acetate. The extract was dried over anhydrous potassium carbonate, and then, the solvent was removed under reduced pressure. The residue was purified by silica gel flash column chromatography (solvent: chloroform-methanol-ammonia {(90:10:1)), and the

Claims

1. An aliphatic nitrogen-containing 5-membered ring compound represented by the formula [I]: R? rex YY NH-CH=00-N A [1] CN wherein A represents -CH;- or -5-, rR? represents hydrogen atom, a lower alkyl group, a hydroxy lower alkyl group or a lower alkoxy lower alkyl group, X represents -N(R?) -, -0- or -CO-, where R® repre- sents hydrogen atom or a lower alkyl group, and R? represents (1) a cyclic group which may be substituted, where the cyclic group portion is (i) a monocyclic, bicyclic or tricyclic hydrocarbon group, Or (ii) a monocyclic, bicyclic or tricyclic hetero- cyclic group, or (2) an amino group which may be substituted, or a pharmaceutically acceptable salt thereof.

2. The compound according to Claim 1, wherein RZ is (1) a cyclic group which may have 1 to 3 substituents which are the same or different and selected from the substi- tuents of Group A mentioned below, where the cyclic group portion is (i) a monocyclic, bicyclic or tricyclic hydro- carbon group, or (ii) a monocyclic, bicyclic or tricyclic heterocyclic group, cr (2) an amino group which may have 1 or 2 substituents which are the same or different and selected from the substi- tuents of Group B mentioned below. Substituents of Group A:

« -% a halogen atom; cyano group; nitro group; oxo group; hydroxy group; carboxy group; oxidyl group; amino group; carbamoyl group; aminosulfonyl group; a lower alkyl group; a lower alkoxy group; a lower alkanoyl group; a lower alkoxycarbonyl group; a lower alkoxy-substituted lower alkanoyl group; a lower alkoxycarbonyl-substituted lower alkoxy group; a lower alkoxycarbonyl-substituted lower alkoxycarbonyl : group; a lower alkylthio group; a lower alkylsulfonyl group; a di-lower alkylamino-substituted lower alkoxy group; a di-lower alkylaminocarboxy group; a lower alkyl group substituted by a—greup group (8) selected from amino group, carbamoyl group, a halogen atom, hydroxy group, carboxy group, a lower alkoxy group and mono- or di- substituted amino group; a mono- or di-substituted amino group; a mono- or di-substituted carbamoyl group; a substituted or unsubstituted lower cycloalkyl group; a substituted or unsubstituted lower cycloalkyl-CO-; a substituted or unsubstituted lower cycloalkyl-lower alkyl group; a substituted or unsubstituted phenyl group; a substituted or unsubstituted phenyl-0-; a substituted or unsubstituted phenyl-CO-; a substituted or unsubstituted phenyl-lower alkyl group;, a substituted or unsubstituted phenyl-0O-lower alkyl group; a substituted or unsubstituted phenylsulfonyl group; a substituted or unsubstituted phenyl-lower alkoxy group; a substituted or unsubstituted phenyl-lower alkoxycarbonyl group; a substituted or unsubstituted lower cycloalkenyl group; a substituted or unsubstituted bicyclic heterocyclic group; a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group;

a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-0-; a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO-; a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO-lower alkyl group; and : a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-lower alkyl group. Substituents of Group B: a lower alkyl group; a lower alkoxy-substituted lower alkyl group; a lower alkoxycarbonyl-substituted lower alkyl group; a hydroxy lower alkyl group; a carboxy lower alkyl group; a substituted or unsubstituted lower cycloalkyl group; a substituted or unsubstituted lower cycloalkyl-lower alkyl group; a substituted or unsubstituted phenyl group; a substituted or unsubstituted phenyl-lower alkyl group;, a substituted or unsubstituted bicyclic hydrocarbon group; a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group; a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-lower alkyl group; and a substituted or unsubstituted bicyclic heterocyclic group- lower alkyl group.

3. The compound according to Claim 2, wherein when the ) ~ nwgybstituent selected from the substituents of Group A" is a mono- or di-substituted amino lower alkyl group, a mono- or di-substituted amino group or a mono- or di-substituted carbamoyl group, then the substituent has substituent(s) selected from the substituents of Group C mentioned below; when the "substituent selected from the substituents of Group A" is a substituted lower cycloalkyl group, a substi- tuted lower cycloalkyl-CO-, a substituted lower cycloalkyl- lower alkyl group, a substituted phenyl group, a substi-

tuted phenyl-0O-, a substituted phenyl-CO-, a substituted phenyl-lower alkyl group, a substituted phenyl-0-lower alkyl group, a substituted phenylsulfonyl group, a substi- tuted phenyl-lower alkoxy group, a substituted phenyl-lower alkoxycarbonyl group, a substituted lower cycloalkenyl group, a substituted bicyclic heterocyclic group, a substi- tuted monocyclic 5- or 6-membered heterocyclic group, a substituted monocyclic 5- or 6-membered heterocyclic group- oo O-, a substituted monocyclic 5- or 6-membered heterocyclic group-CO-, a substituted monocyclic 5- or 6-membered heterocyclic group-CO-lower alkyl group or a substituted monocyclic 5- or 6-membered heterocyclic group-lower alkyl group, then the substituent has substituent (s) selected from a halogen atom, cyano group, nitro group, oxo group and the substituents of Group C mentioned below; and when the "substituent selected from the substituents of Group B" is a substituted lower cycloalkyl group, a substi- tuted lower cycloalkyl-lower alkyl group, a substituted phenyl group, a substituted phenyl-lower alkyl group, a substituted bicyclic hydrocarbon group, a substituted monocyclic 5- or 6-membered heterocyclic group, a substi- tuted monocyclic 5- or 6-membered heterocyclic group-lower alkyl group or a substituted bicyclic heterocyclic group- lower alkyl group, then the substituent has substituent(s) selected from the substituents of Group C mentioned below.

Substituents of Group C: a lower alkyl group; a hydroxy - lower alkyl group; a lower alkanoyl group; a lower cycloalkylcarbonyl group; a lower alkoxy group; a lower alkoxycarbonyl group; a lower alkyl- : sulfonyl group; a di-lower alkyl-substituted carbamoyl group; a di-lower alkylamino-substituted lower alkanoyl group; a substituted or unsubstituted phenyl group; a substituted or unsubstituted phenyl-O-; a substituted or unsubstituted phenyl-CO-; a substituted or unsubstituted phenyl-lower alkanoyl group;

a substituted or unsubstituted phenyl-lower alkyl group; a substituted or unsubstituted phenyl-lower alkoxy group; a substituted or unsubstituted monocyclic 5. or 6-membered heterocyclic group; a substituted or unsubstituted monocyclic 5- or 6-membered ’ heterocyclic group-0-; a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO-; and a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-substituted amino group; (in the substituents of Group C, a substituent in the substituted phenyl group portion or the substituted monocyclic 5- or 6-membered heterocyclic group portion is selected from a halogen atom, cyano group, nitro group, oxo group, a lower alkyl group, a lower alkoxy group, a lower alkanoyl group and a lower alkoxycarbonyl group).

4. The compound according to any one of Claims 1 to 3, wherein R? is (1) a cyclic group which may be substituted, where the cyclic group portion is a group selected from the following (i) to (iw) (i) a monocyclic hydrocarbon group having 3 to 7 carbon atoms, (ii) a bicyclic hydrocarbon group having 9 to 11 carbon atoms, - (iii) a monocyclic heterocyclic group containing 1 or 2 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom, and (iv) a bicyclic heterocyclic group containing 1 to 3 hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom and comprising two 5- to 7-membered rings being fused; or (2) a substituted amino group.

5. The compound according to Claim 4, wherein R? is

(1) a cyclic group which may be substituted, where the cyclic group portion is a group selected from phenyl group, cyclohexyl group, cyclopentyl group, cyclobutyl group, cyclopropyl group, an indanyl group, an indenyl group, a naphthyl group, tetrahydronaphthyl, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidin- yl group, an oxolanyl group, a thiolanyl group, a pyrrolin- yl group, an imidazolinyl group, a pyrazolinyl group, a pyrrolyl group, an imidazolyl group, a pyrazolyl group, a triazolyl group, a tetrazolyl group, a furyl group, an oxazolyl group, an isoxazolyl group, an oxadiazolyl group, a thienyl group, a thiazolyl group, an isothiazolyl group, a thiadiazolyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a pyranyl group, a tetrahydropyridyl group, a dihydreopyridazinyl group, a perhydrcazepinyl group, a perhydrothiazepinyl group, an indolinyl group, an iso- indolinyl group, an indolyl group, an indazolyl group, an isoindolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzoxazolyl group, a benzodioxolanyl group, a benzothienyl group, a benzofuryl group, a thienopyridyl group, a thiazolopyridyl group, a pyrrolopyridyl group, a dihydropyrrolopyridyl group, a quinolyl group, an iso- quinolyl group, a quinoxalinyl group, a guinazolinyl group, a phthalazinyl group, a cinnolinyl group, a chromanyl group, an isochromanyl group, a naphthyridinyl group and partially or completely saturated cyclic groups thereof; or (2) a substituted amino group. 30-

6. The compound according to Claim 5, wherein R? is {1) a cyclic group which may be substituted, where the cyclic group portion is a group selected from the group consisting of phenyl group, cyclohexyl group, a pyrrolidin- yl group, a tetrazolyl group, a furyl group, a thienyl group, a thiazolyl group, a piperidyl group, a piperazinyl

} group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a perhydroazepinyl group, an indolinyl group, an isoindolinyl group, a benzothienyl group, a thienopyridyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group, a quinolyl group, an isoquinolyl group, a quinoxalinyl group and partially or completely saturated cyclic groups thereof; or (2) a substituted amino group.

7. The compound according to Claim 6, wherein R? is (1) a cyclic group which may be substituted, where the cyclic group portion is a group selected from the group consisting of a pyrrolidinyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a Pyridyl group, a pyrimidinyl group, an indolinyl group, an isoindolinyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group and partially or completely saturated cyclic groups thereof; or (2) a substituted amino group.

8. The compound according to any one of Claims 1 to 3, wherein R? is (1) a cyclic group which may have 1 to 3 substituents which are the same or different and selected from the substitu- ents of Group A" mentioned below, where the cyclic group portion is selected from the group consisting of a pyrrolidinyl group, a piperidyl group, a piperazinyl group, a morpholinyl group, a thiomorpholinyl group, a pyridyl group, a pyrimidinyl group, an indolinyl group, an isoindolinyl group, a pyrrolopyridyl group, a dihydro- pyrrolopyridyl group and partially or completely saturated cyclic groups thereof; or (2) an amino group substituted by 1 or 2 substituents which are the same or different and selected from the substitu-

ents of Group B' mentioned below. Substituents of Group A': a halogen atom, cyano group, nitro group, o0xoc group, carbamoyl group, a lower alkyl group, a lower alkoxy group, a lower alkanoyl group, a lower alkoxycarbonyl group, a. lower alkoxy-substituted lower alkyl group, a mono- or di- substituted amino group, a mono- or di-substituted carbamoyl group, oo a lower cycloalkyl-CO-, ' a substituted or unsubstituted phenyl group, a substituted or unsubstituted phenyl-lower alkyl group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group, a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-0-, and a substituted or unsubstituted monocyclic 5- or 6-membered heterocyclic group-CO-. Substituents of Group B': a lower alkyl group, a lower cycloalkyl group, a lower alkoxy-substituted lower alkyl group, a pyrimidinyl group, a thiazolyl group and a thiadiazolyl group.

9. The compound according to any one of Claims 1 to 8, wherein X is -N(R?)- or -0-, and R® is a cyclic group which may be substituted.

10. The compound according to any one of Claims 1 to 8, wherein X is -CO-, and R? is (1) a monocyclic, bicyclic or tricyclic nitrogen-containing heterocyclic group which may be substituted or (2) an amino group which may be substi- tuted, and represented by the formula: N—

11. The compound according to any one of Claims 1 to 8,

wherein X is -CO- or -0-, and A is -CH,-.

12. The compound according to any one of Claims 1 to 8, wherein X is -CO- or -0-, A is -CH,-, and R! is hydrogen atom,

13. The compound according to any one of Claims 1 to 8, wherein X is -CO-, A is -CH,-, and R! is hydrogen atom.

14. The compound according to any one of Claims 1 to 8, wherein X is -CO-, A is -CH,-, R' is hydrogen atom, and R? is a cyclic group which may be substituted.

15. The compound according to any one of Claims 1 to 8, wherein X is -CO-, A is -CH,-, R! is hydrogen atom, and R? is a substituted amino group.

16. The compound according to any one of Claims 1 to 15 which has a partial structure shown below. 1 Rg — Xn Od NH—

17. A compound selected from the group consisting of: (S) -2-cyano-1-[trans-4-(5-nitro-2-pyridylamino) - cyclohexylaminoc]acetylpyrrolidine; (S) -2-cyano-1-[trans-4-(5-cyano-2-pyridyloxy)cyclo- hexylaminol]acetylpyrrolidine; : (8) -2-cyano-1-[trans-4-(dimethylaminocarbonyl)cyclo- hexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4- (morpholinocarbonyl)cyclo- hexylamino)acetylpyrrolidine; (8) -2-cyanc-1-[trans-4-(5-bromo-2-pyrimidinyloxy) - cyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1-[trans-4-(5-pyrimidinylaminocarbonyl) - cyclohexylamino]acetylpyrrolidine;

(S) -2-cyano-1-[trans-4- (N-ethyl-N-methoxyethylamino- carbonyl) cyclohexylamino] acetylpyrrolidine; (S) -2-cyano-1-[trans-4- (N-ethyl-N-isopropylamino- carbonyl) cyclohexylamino] acetylpyrrolidine; (S) -2-cyano-1- [trans-4- (N-methyl-N-butylamino- carbonyl) cyclohexylamino]acetylpyrrolidine; ; (S) -2-cyano-1-[trans-4-[(S)-2-methoxymethylpyrroli- din-1-ylcarbonyl]cyclohexylamino] acetylpyrrolidine; (S) -2-cyano-1-[trans-4- (3-carbamoylpiperidino- carbonyl) cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(3-nitro-2-pyridylamino) - cyclohexylamino] acetylpyrrolidine; (S) -2-cyano-1-[trans-4- (4-acetylpiperazin-1-yl- carbonyl) cyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1- [trans-4-(2-isoindelinylcarbonyl) - cyclohexylaminolacetylpyrrolidine; (S)-2-cyanoc-1-{trans-4-[4-(3-pyridylcarbonyl)- piperazin-l-ylcarbonyl]cyclohexylaminolacetylpyrrolidine; (S) -2-cyano-1-{trans-4-[4- (3-thenoyl)piperazin-1-yl- carbonyl] cyclohexylaminolacetylpyrrolidine; (S) -2-cyano-1-{trans-4-[4-(4-chlorophenyl)piperazin- l-ylcarbonyl]cyclohexylaminoclacetylpyrrolidine; (S)-2-cyano-1- [trans-4-(cis-2,6-dimethylmorpholino- carbonyl) cyclohexylamino] acetylpyrrolidine; (S) -2-cyano-1- [trans-4-{5-nitro-2-isoindolinyl- carbonyl) cyclohexylamino] acetylpyrrolidine; (S)-2-cyano-1- [trans-4- (piperidinocarbonyl)cyclo- hexylamino]acetylpyrrolidine; (8) -2-cyano-1- [trans-4- (4-carbamoylpiperidino- carbonyl) cyclohexylamino] acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(l-pyrrolidinylcarbonyl) - cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-(4-cyclopropylcarbonyl- piperazin-1l-ylcarbonyl)cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4- (4-propionylpiperazin-1-yl- carbonyl) cyclohexylamino]acetylpyrrolidine;

(S) -2-cyano-1-[trans-4-(1-indolinylcarbonyl)cyclo- hexylamino]acetylpyrrolidine; (S) -2-cyano-1-[trans-4-(2,3-dihydro-1H-pyrrolo[3,4- blpyridin-2-ylcarbonyl)cyclohexylamino]acetylpyrrolidine; (S)-2-cyano-1-[trans-4-[4-(2-pyrimidinyloxy) - piperidinocarbonyl]cyclohexylamino]acetylpyrrolidine; (s)-2-cyano-1-{trans-4-[4- (5-bromo-2-pyrimidinyloxy) - piperidinocarbonyl]cyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1-[trans-4-(cis-3,5-dimethyl-4-benzyl- : piperazin-1l-ylcarbonyl)cyclohexylamino]acetylpyrrolidine; (S) -2-cyano-1- [trans-4- (4-cyclohexylcarbonylamino- piperidinocarbonyl)cyclohexylamino]acetylpyrrolidine; (S) -2-cyano-1-{trans-4-[4- (N-phenylcarbamoyl) - piperazin-1l-ylcarbonyl]cyclohexylaminolacetylpyrrolidine; (S)-2-cyano-1-[trans-4- (4-ethoxycarbonylpiperazin-1- yYlcarbonyl)cyclohexylamino] acetylpyrrolidine; (8S) -2-cyano-1-{trans-4-{4-{(2-thienyl)piperidino- carbonyl] cyclohexylaminec] acetylpyrrolidine; (S) -2-cyano-1-[trans-4-(1,1-dioxoperhydro-1,4- thiazin-4-ylcarbonyl)cyclohexylamino]acetylpyrrolidine; (R) -4-cyano-3-[trans-4- (5-nitro-2-pyridylamino) - cyclohexylamino]acetylthiazolidine; (R) -4-cyano-3- [trans-4-(5-cyano-2-pyridyloxy)cyclo- hexylamino]acetylthiazolidine; (R) -4-cyano-3- [trans-4- (dimethylaminocarbonyl)cyclo- hexylamino]acetylthiazolidine; (R) -4-cyano-3- [trans-4- (2-isoindolinylcarbonyl)cyclo- hexylaminol]acetylthiazolidine; (R) -4-cyano-3-[trans-4- {morpholinocarbonyl)cyclo- hexylamino]acetylthiazolidine; and (R) -4-cyano-3- [trans-4- (pyrrolidinylcarbonyl)cyclo- hexylaminol]acetylthiazolidine; or a pharmaceutically acceptable salt thereof.

18. A method for preparing an aliphatic nitrogen- containing 5-membered ring compound represented by the formula [I]: R? aN ex Yomorcon™S CN : wherein A represents -CH,- or -S-, rR! represents hydrogen atom, a lower alkyl group, a hydroxy lower alkyl group or a lower alkoxy lower alkyl group, X represents -N(R’)-, -O- or -CO-, where R® repre- sents hydrogen atom or a lower alkyl group, and R? represents (1) a cyclic group which may be substituted, where the cyclic group portion represents (i) a monocyclic, bicyclic or tricyclic hydrocarbon group, or {ii) a monocyclic, bicyclic or tricyclic heterocyclic group, or (2) an amino group which may be substituted, or a pharmaceutically acceptable salt thereof, which comprises reacting a compound represented by the formula [II]: 1 PN Z —CHy—CO-—-N A il I] : 20 CN wherein A has the same meaning as defined above and 7! represents a reactive residue, with a compound represented by the formula [III]: R? R2—X— NH, [III] wherein R!, X and R? has the same meaning as defined above,

or a salt thereof, and optionally making the product into a pharmaceutically acceptable salt thereof.

19. A method for preparing an aliphatic nitrogen-contain- ing 5-membered ring compound represented by the formula [I-a]: eco Ynn-CHe-co—y A = CN wherein A represents -CH,- or -S-, R! represents hydrogen atom, a lower alkyl group, a hydroxy lower alkyl group or a lower alkoxy lower alkyl group, and R?*! represents (1) a monocyclic, bicyclic or tricyclic nitrogen-containing heterocyclic group, which may be substituted or (2) an amino group which may be substituted, and represented by the formula: { N— NE or a pharmaceutically acceptable salt thereof, which comprises reacting a compound represented by the formula [IV]: . ot ooo) y-oteoony AY) R? CN wherein A and R! have the same meanings as defined above and R* represents a protective group for an amino group, or a salt thereof with the compound represented by the formula [V]: R*-H [vl wherein R** has the same meaning as defined above, or a salt thereof to obtain a compound represented by the ~~ formula (vil: : R! 21_ | VN : R co Yn-ote-co—y A [VI] 4 / R CN wherein R', RY, R*! and A have the same meanings as defined above, } or a salt thereof, and subsequently removing the protective ~~ group for an amino group R*, and optionally making the : product into a pharmaceutically acceptable salt thereof.

20. A compound according to any one of Claims 1 to 17 for treatment or prophylaxis of a disease which comprises administering to a patient an effective dose.

21. A pharmaceutical composition for treatment or prophylaxis of a disease according to Claim 20, wherein the disease is ‘ expected to be alleviated by inhibiting dipeptidylpeptidase IV activity.

22. A pharmaceutical composition for treatment or prophylaxis - of a disease according to Claim 20, wherein the disease is diabetes.

23. A pharmaceutical composition for treatment or prophylaxis of a disease according to Claim 20, wherein the disease is a type 2 diabetes. :

24. Use of the compound according to any one of Claims 1 to 17 as a pharmaceutically effective ingredient of a medicine. Cn oo EEE AMENDED SHEET . © . B N —- ee ee r—————— HN

25. Use of the compound according to any one of Claims 1 to 17 for the preparation of a medicine.

26. The use according to Claim 24 or 25, wherein the medicine is for the treatment of prophylaxis of a disease that is expected to be improved by inhibiting dipeptidylpeptidase IV activity.

27. The use according to Claim 24 or 25, wherein the medicine is for the treatment or prophylaxis -of diabetes.

28. The use according to Claim 24 or 25, wherein the medicine is for the treatment or prophylaxis of type 2 diabetes.

29. A pharmaceutical composition comprising the compound according to any one of Claims 1 to 17 as an effective ingredient, :

30. The pharmaceutical composition according to Claim 29 wherein the pharmaceutical composition is a dipeptidylpeptidase IV inhibitor. AMENDED SHEET