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0343695074
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Benzyl sulfones have been successfully deprotonated by phosphazene base P4-t-Bu in the diastereoselective aldol reaction with aldehydes: (a) Benzyl sulfones have been successfully deprotonated by phosphazene base P4-t-Bu in the diastereoselective aldol reaction with aldehydes: Solladié-Cavallo A., Roche D., Fischer J., De Chian A. J. Org. Chem. 61:1996;2690-2694 (b) Costa A., Nájera C., Sansano J.M. J. Org. Chem. 67:2002;5216-5225.
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Benzyl sulfones have been successfully deprotonated by phosphazene base P4-t-Bu in the diastereoselective aldol reaction with aldehydes: (a) Benzyl sulfones have been successfully deprotonated by phosphazene base P4-t-Bu in the diastereoselective aldol reaction with aldehydes: Solladié-Cavallo A., Roche D., Fischer J., De Chian A. J. Org. Chem. 61:1996;2690-2694 (b) Costa A., Nájera C., Sansano J.M. J. Org. Chem. 67:2002;5216-5225.
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Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: (a) Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: Siemann E.H., Creasy L.L. Am. J. Enol. Vitic. 43:1992;49-52 (b) Soleas G.J., Diamandis E.P., Goldberg D.M. Clin. Biochem. 62:1997;4821-4826 (c) Jang M., Cai L., Udenai G.O., Slowing K.V., Thomas C.F., Beecher C.W.W., Fong H.H.S., Farnsworth N.R., Kinghorn A.D., Mehta R.G., Moon R.C., Pezzuto J.M. Science. 275:1997;218-220 (d) Orsini F., Pelizzoni F., Verotta L., Aburjai T., Rogers C.B. J. Nat. Prod. 60:1997;1082-1087 (e) Fremont L. Life Sci. 66:2000;663-673 (f) Gusman J., Malonne H., Atassi G. Carcinogenesis. 22:2001;1111-1117 (g) Howitz K.T., Bitterman K.J., Cohen H.Y., Lamming D.W., Lavu S., Wood J.G., Zipkin R.E., Chung P., Kisielewski A., Zhang L.L., Scherer B., Sinclair D.A. Nature. 425:2003;191-196.
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Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: (a) Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: Siemann E.H., Creasy L.L. Am. J. Enol. Vitic. 43:1992;49-52 (b) Soleas G.J., Diamandis E.P., Goldberg D.M. Clin. Biochem. 62:1997;4821-4826 (c) Jang M., Cai L., Udenai G.O., Slowing K.V., Thomas C.F., Beecher C.W.W., Fong H.H.S., Farnsworth N.R., Kinghorn A.D., Mehta R.G., Moon R.C., Pezzuto J.M. Science. 275:1997;218-220 (d) Orsini F., Pelizzoni F., Verotta L., Aburjai T., Rogers C.B. J. Nat. Prod. 60:1997;1082-1087 (e) Fremont L. Life Sci. 66:2000;663-673 (f) Gusman J., Malonne H., Atassi G. Carcinogenesis. 22:2001;1111-1117 (g) Howitz K.T., Bitterman K.J., Cohen H.Y., Lamming D.W., Lavu S., Wood J.G., Zipkin R.E., Chung P., Kisielewski A., Zhang L.L., Scherer B., Sinclair D.A. Nature. 425:2003;191-196.
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Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: (a) Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: Siemann E.H., Creasy L.L. Am. J. Enol. Vitic. 43:1992;49-52 (b) Soleas G.J., Diamandis E.P., Goldberg D.M. Clin. Biochem. 62:1997;4821-4826 (c) Jang M., Cai L., Udenai G.O., Slowing K.V., Thomas C.F., Beecher C.W.W., Fong H.H.S., Farnsworth N.R., Kinghorn A.D., Mehta R.G., Moon R.C., Pezzuto J.M. Science. 275:1997;218-220 (d) Orsini F., Pelizzoni F., Verotta L., Aburjai T., Rogers C.B. J. Nat. Prod. 60:1997;1082-1087 (e) Fremont L. Life Sci. 66:2000;663-673 (f) Gusman J., Malonne H., Atassi G. Carcinogenesis. 22:2001;1111-1117 (g) Howitz K.T., Bitterman K.J., Cohen H.Y., Lamming D.W., Lavu S., Wood J.G., Zipkin R.E., Chung P., Kisielewski A., Zhang L.L., Scherer B., Sinclair D.A. Nature. 425:2003;191-196.
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Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: (a) Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: Siemann E.H., Creasy L.L. Am. J. Enol. Vitic. 43:1992;49-52 (b) Soleas G.J., Diamandis E.P., Goldberg D.M. Clin. Biochem. 62:1997;4821-4826 (c) Jang M., Cai L., Udenai G.O., Slowing K.V., Thomas C.F., Beecher C.W.W., Fong H.H.S., Farnsworth N.R., Kinghorn A.D., Mehta R.G., Moon R.C., Pezzuto J.M. Science. 275:1997;218-220 (d) Orsini F., Pelizzoni F., Verotta L., Aburjai T., Rogers C.B. J. Nat. Prod. 60:1997;1082-1087 (e) Fremont L. Life Sci. 66:2000;663-673 (f) Gusman J., Malonne H., Atassi G. Carcinogenesis. 22:2001;1111-1117 (g) Howitz K.T., Bitterman K.J., Cohen H.Y., Lamming D.W., Lavu S., Wood J.G., Zipkin R.E., Chung P., Kisielewski A., Zhang L.L., Scherer B., Sinclair D.A. Nature. 425:2003;191-196.
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Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: (a) Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: Siemann E.H., Creasy L.L. Am. J. Enol. Vitic. 43:1992;49-52 (b) Soleas G.J., Diamandis E.P., Goldberg D.M. Clin. Biochem. 62:1997;4821-4826 (c) Jang M., Cai L., Udenai G.O., Slowing K.V., Thomas C.F., Beecher C.W.W., Fong H.H.S., Farnsworth N.R., Kinghorn A.D., Mehta R.G., Moon R.C., Pezzuto J.M. Science. 275:1997;218-220 (d) Orsini F., Pelizzoni F., Verotta L., Aburjai T., Rogers C.B. J. Nat. Prod. 60:1997;1082-1087 (e) Fremont L. Life Sci. 66:2000;663-673 (f) Gusman J., Malonne H., Atassi G. Carcinogenesis. 22:2001;1111-1117 (g) Howitz K.T., Bitterman K.J., Cohen H.Y., Lamming D.W., Lavu S., Wood J.G., Zipkin R.E., Chung P., Kisielewski A., Zhang L.L., Scherer B., Sinclair D.A. Nature. 425:2003;191-196.
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Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: (a) Resveratrol, a natural polyhydroxylated stilbene, has been shown to exhibit a variety of unique and useful biological antioxidant, antimutagenic and lifespan extention properties: Siemann E.H., Creasy L.L. Am. J. Enol. Vitic. 43:1992;49-52 (b) Soleas G.J., Diamandis E.P., Goldberg D.M. Clin. Biochem. 62:1997;4821-4826 (c) Jang M., Cai L., Udenai G.O., Slowing K.V., Thomas C.F., Beecher C.W.W., Fong H.H.S., Farnsworth N.R., Kinghorn A.D., Mehta R.G., Moon R.C., Pezzuto J.M. Science. 275:1997;218-220 (d) Orsini F., Pelizzoni F., Verotta L., Aburjai T., Rogers C.B. J. Nat. Prod. 60:1997;1082-1087 (e) Fremont L. Life Sci. 66:2000;663-673 (f) Gusman J., Malonne H., Atassi G. Carcinogenesis. 22:2001;1111-1117 (g) Howitz K.T., Bitterman K.J., Cohen H.Y., Lamming D.W., Lavu S., Wood J.G., Zipkin R.E., Chung P., Kisielewski A., Zhang L.L., Scherer B., Sinclair D.A. Nature. 425:2003;191-196.
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38
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85030921674
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7bcouldpreventthediastereomericequilibrationthrougharetroaddition/ additionprocess,duetothelowerstabilityofthecorrespondingbenzyliccarbanion
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We believe that in this case, the presence of two electron-donating groups in sulfone 7b could prevent the diastereomeric equilibration through a retroaddition/addition process, due to the lower stability of the corresponding benzylic carbanion.
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39
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85030932440
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note
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Other additives tested, such as DMPU, did not show any effect.
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40
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0035945039
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For a discussion about the nature of P4-t-Bu enolates, see:
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For a discussion about the nature of P4-t-Bu enolates, see: Fruchart J.-S., Gras-Masse H., Melnyk O. Tetrahedron Lett. 42:2001;9153-9155.
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Fruchart, J.-S.1
Gras-Masse, H.2
Melnyk, O.3
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41
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0037011901
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Compound 9fhasbeenshowntobeapotentandselectivehumancytochromeP4501B1inhibitor:
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Compound 9f has been shown to be a potent and selective human cytochrome P450 1B1 inhibitor: Kim S., Ko H., Park J.E., Jung S., Lee S.K., Chun Y.-J. J. Med. Chem. 45:2002;160-164.
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Kim, S.1
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