Gamma secretase modulators

1. A compound of the formula:

or a pharmaceutically acceptable salt thereof, wherein:

R 1 and R 2 are joined together to form a piperidine, wherein said piperidine is optionally substituted with 1-5 independently selected R 21 substituents;

U is N;

W is —O—;

G is —(C(R 3 )(R 4 )) 2 —(wherein each R 3 and each R 4 are independently selected);

V is a bond;

each R 6 and R 7 is independently selected from the group consisting of H, alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl-, wherein each of said alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl- is optionally substituted with 1-5 independently selected R 21 substituents;

each R 3 is independently selected from the group consisting of H, halo, —OR 15 , —CN, —SR 15 , —NR 15 R 16 , —N(R 15 )C(O)R 16 , —N(R 15 )S(O)R 16 , —N(R 15 )S(O) 2 R 16 , —N(R 15 )S(O) 2 N(R 16 )(R 17 ),—N(R 15 )S(O)N(R 16 )(R 17 ), —N(R 15 )C(O)N(R 16 )R 17 ), —N(R 15 )C(O)OR 16 , —C(O)R 15 , —C(O)OR 15 , —C(═NOR 15 )R 16 , —C(O)N(R 15 )(R 16 ), —S(O)N(R 15 )(R 16 ),S(O) 2 N(R 15 )(R 16 ), —S(O)R 15 , —S(O) 2 R 24 , —P(O)(OR 15 )(OR 16 ), ═NOR 15 , —N 3 , alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl-, wherein each of said alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl- is optionally substituted with 1-5 independently selected R 21 substituents;

each R 4 is independently selected from the group consisting of H, halo, —OR 15 , —CN, —SR 15 , —NR 15 R 16 , —N(R 15 )C(O)R 16 , —N(R 15 )S(O)R 16 , —N(R 15 )S(O) 2 R 16 , —N(R 15 )S(O) 2 N(R 16 (R 17 ), —N(R 15 )S(O)N(R 16 )(R 17 ), —N(R 15 )C(O)N(R 16 )(R 17 ), —N(R 15 )C(O)OR 16 , —C(O)R 15 , —C(O)OR 15 , —C(═NOR 15 )R 16 , —C(O)N(R 15 )(R 16 ), —S(O)N(R 15 )(R 16 ), —S(O) 2 N(R 15 )(R 16 ), —S(O)R 15 , —S(O) 2 R 24 , —P(O)(OR 15 )(OR 16 ), ═NOR 15 , —N 3 , alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl-, wherein each of said alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl- is optionally substituted with 1-5 independently selected R 21 substituents, and

provided that when one of R 3 or R 4 is selected from the group consisting of: —OR 15 , —CN, —SR 15 , —NR 15 R 16 , —N(R 15 )C(O)R 16 , —N(R 15 )S(O)R 16 , —N(R 15 )S(O) 2 R 16 , —N(R 15 )S(O) 2 N(R 16 )(R 17 ), —N(R 15 )S(O)N(R 16 )(R 17 ), —N(R 15 )C(O)N(R 16 )(R 17 ), —N(R 15 )C(O)OR 16 , —S(O)N(R 15 )(R 16 ), —S(O) 2 N(R 15 )(R 16 ), —S(O)R 15 , —S(O) 2 R 24 , —P(O)(OR 15 )(OR 16 ), ═NOR 15 , and —N 3 , then the other is not selected from the group consisting of: —OR 15 , —CN, —SR 15 , —NR 15 R 16 , —N(R 15 )C(O)R 16 , —N(R 15 )S(O)R 16 , —N(R 15 )S(O) 2 R 16 , —N(R 15 )S(O) 2 N(R 16 )(R 17 ), —N(R 15 )S(O)N(R 16 )(R 17 ), —N(R 15 )C(O)N(R 16 )(R 17 ), —N(R 15 )C(O)OR 16 , —S(O)N(R 15 )(R 16 ), —S(O) 2 N(R 15 )(R 16 ), —S(O)R 15 , —S(O) 2 R 24 , —P(O)(OR 15 )(OR 16 ), ═NOR 15 , and —N 3 ;

R 8 is selected from the group consisting of H, halo, alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl-, with each of said alkyl-, alkenyl-, alkynyl-, aryl-, arylalkyl-, alkylaryl-, cycloalkyl-, cycloalkylalkyl-, heteroaryl-, heteroarylalkyl-, heterocyclyl- and heterocyclylalkyl- being optionally substituted with 1-3 independently selected R 21 substituents;

R 9 is selected from the group consisting of

R 10 is selected from the group consisting of

R 15 , R 16 and R 17 are independently selected from the group consisting of H, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl-, heterocyclyl, heterocyclylalkyl-, aryl, arylalkyl-, heteroaryl, heteroarylalkyl-, arylcycloalkyl-, arylheterocyclyl-, (R 18 ) r -alkyl-, (R 18 ) r -cycloalkyl, (R 18 ) r -cycloalkylalkyl-, (R 18 ) r -heterocyclyl, (R 18 ) r -heterocyclylalkyl-, (R 18 ) r -aryl, (R 18 ) r -arylalkyl-, (R 18 ), -heteroaryl and (R 18 ), -heteroarylalkyl-; wherein r is 1-5;

each R 18 is independently selected from the group consisting of alkyl, alkenyl, alkynyl, aryl, arylalkyl-, arylalkenyl-, arylalkynyl-, —NO 2 , halo, heteroaryl, HO-alkyoxyalkyl-, —CF 3 , —CN, alkyl-CN, —C(O)R 19 , —C(O)OH, —C(O)OR 19 , —C(O)NHR 20 , —C(O)NH 2 , —C(O)NH 2 —C(O)N(alkyl) 2 , —C(O)N(alkyl)(aryl), —C(O)N(alkyl)(heteroaryl), —SR 19 , —S(O) 2 R 20 , —S(O)NH 2 , —S(O)NH(alkyl), —S(O)N(alkyl)(alkyl), —S(O)NH(aryl), —S(O) 2 NH 2 , —S(O) 2 NHR 19 , —S(O) 2 NH(heterocyclyl), —S(O) 2 N(alkyl) 2 , —S(O) 2 N(alkyl)(aryl), —OCF 3 , —OH, —OR 20 , —O-heterocyclyl, —O-cycloalkylalkyl, —O-heterocyclylalkyl, —NH 2 , —NHR 20 , —N(alkyl) 2 , —N(arylalkyl) 2 , —N(arylalkyl)-(heteroarylalkyl), —NHC(O)R 20 , —NHC(O)NH 2 , —NHC(O)NH(alkyl), —NHC(O)N(alkyl)(alkyl), —N(alkyl)C(O)NH(alkyl), —N(alkyl)C(O)N(alkyl)(alkyl), —NHS(O) 2 R 20 , —NHS(O) 2 NH(alkyl), —NHS(O) 2 N(alkyl)(alkyl), —N(alkyl)S(O) 2 NH(alkyl) and —N(alkyl)S(O) 2 N(alkyl)(alkyl);

or, alternately, two R 18 moieties on adjacent carbons can be linked together to form:

R 19 is selected from the group consisting of: alkyl, cycloalkyl, aryl, arylalkyl- and heteroarylalkyl-;

R ° is selected from the group consisting of: alkyl, cycloalkyl, aryl, halo substituted aryl, arylalkyl-, heteroaryl and heteroarylalkyl-;

each R 21 group is independently selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl-, cycloalkenyl, heterocyclyl, heterocyclylalkyl-, aryl, arylalkyl-, heteroaryl, heteroarylalkyl-, halo, —CN, —OR 15 , —C(O)R 15 , —C(O)OR 15 , —C(O)N(R 15 )(R 16 ), —SF 5 , —OSF 5 , —Si(R 24 ) 3 wherein each R 24 is independently selected, —SR 15 , —S(O)N(R 15 )(R 16 ), —CH(R 15 )(R 16 ), —S(O) 2 N(R 15 )(R 16 ), —C(═NOR 15 )R 16 , —P(O)(OR 15 )(OR 16 ), —N(R 15 )(R 16 ), -alkyl-N(R 15 )(R 16 ), —N(R 15 )C(O)R 16 , —CH 2 —N(R 15 )C(O)R 16 , —CH 2 —N(R 15 )C(O)N(R 16 )(R 17 ), —CH 2 —R 15 , —CH 2 N(R 15 )(R 16 ), —N(R 15 )S(O)R 16 , —N(R 15 )S(O) 2 R 16 , —CH 2 —N(R 15 )S(O) 2 R 16 , —N(R 15 )S(O) 2 N(R 16 )(R 17 ), —N(R 15 )S(O)N(R 16 )(R 17 ), —N(R 15 )C(O)N(R 16 )(R 17 ), —CH 2 —N(R 15 )C(O)N(R 16 )(R 17 ), —N(R 15 )C(O)OR 16 , —CH 2 —N(R 15 )C(O)OR 16 , —S(O)R 15 , ═NOR 15 , —N 3 , —NO 2 and —S(O) 2 R 24 ; and wherein each of the R 21 alkyl, cycloalkenyl, cycloalkyl, cycloalkylalkyl-, heterocyclyl, heterocyclylalkyl-, aryl, arylalkyl-, heteroaryl, heteroarylalkyl-, alkenyl and alkynyl groups is optionally substituted with 1 to 5 independently selected R 22 groups;

each R 22 is independently selected from the group consisting of: alkyl, cycloalkyl, cycloalkenyl, heterocyclyl, aryl, heteroaryl, halo, —CF 3 , —CN, —OR 15 , —C(O)R 15 , —C(O)OR 15 , -alkyl-C(O)OR 15 , C(O)N(R 15 )(R 16 ), —SF 5 , —OSF 5 , —Si(R 24 ) 3 wherein each R 24 is independently selected, —SR 15 , —S(O)N(R 15 )(R 16 ), —S(O) 2 N(R 15 )(R 16 ), —C(═NOR 15 )R 16 , —P(O)(OR 15 )(OR 16 ), —N(R 15 )(R 16 ), -alkyl-N(R 15 )(R 16 ), —N(R 15 )C(O)R 16 , —CH 2 —N(R 15 )C(O)R 16 , —N(R 15 )S(O)R 16 , —N(R15)S(O) 2 R16, —CH 2 —N(R 15 )S(O) 2 R 16 , —N(R 15 )S(O) 2 N(R 16 )(R 17 ), —N(R 15 )S(O)N(R 16 )(R 17 ), —N(R 15 )C(O)N(R 16 )(R 17 ), —CH 2 —N(R 15 )C(O)N(R 16 )(R 17 ), —N(R 15 )C(O)OR 16 ,—CH 2 —N(R 15 )C(O)OR 16 , —N 3 , ═NOR 15 , -NO 2 , -S(O)R 15 and —S(O) 2 R 24 ; and

each R 24 is independently selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl-, heterocyclyl, heterocyclylalkyl-, aryl, arylalkyl-, heteroaryl, heteroarylalkyl-, arylcycloalkyl-, arylheterocyclyl-, (R 18 ) r -alkyl-, (R 18 ) r -cycloalkyl-, (R 18 ) r -cycloalkylalkyl-, (R 18 ) r -heterocyclyl-, (R 18 ) r -heterocyclylalkyl-, (R 18 ) r -aryl-, (R 18 ) r -arylalkyl-, (R 18 ) r -heteroaryl- and (R 18 ) r -heteroarylalkyl- (wherein R 18 and r are as defined above).

2. The compound of claim 1 or a pharmaceutically acceptable salt thereof, wherein at least one R 21 group selected from the group consisting of: —SF 5 , —OSF 5 , and —Si(R 24 ) 3 is present, and wherein each R 24 is independently selected, and wherein when there is more than one group, each group is independently selected.

3. The compound of claim 1 or a pharmaceutically acceptable salt thereof, wherein said compound is selected from the group consisting of:

4. A compound which is selected from the group consisting of:

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or a pharmaceutically acceptable salt thereof.

5. A pharmaceutical composition comprising a compound of claim 1 or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.

6. A method of treating Alzheimer's disease, comprising administering an effective amount of one or more compounds of claim 1 or a pharmaceutically acceptable salt thereof to a patient in need of treatment.

7. The compound of claim 1 or a pharmaceutically acceptable salt thereof, wherein the R 9 -R 10 moiety is