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Bader SJ, Herr M, Aspnes GE, Cabral S, Li Q, Bian J, Coffey SB, Dowling MS, Fernando DP, Jiao W, Lavergne SY, Kung DW. Route Selection and Optimization in the Synthesis of Two Imidazopyridine Inhibitors of DGAT-2. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.8b00005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Scott J. Bader
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Michael Herr
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Gary E. Aspnes
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Shawn Cabral
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Qifang Li
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Jianwei Bian
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Steven B. Coffey
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Matthew S. Dowling
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Dilinie P. Fernando
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Wenhua Jiao
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Sophie Y. Lavergne
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Daniel W. Kung
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
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Partridge KM, Bader SJ, Buchan ZA, Taylor CE, Montgomery J. A streamlined strategy for aglycone assembly and glycosylation. Angew Chem Int Ed Engl 2013; 52:13647-50. [PMID: 24151089 DOI: 10.1002/anie.201307680] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Indexed: 11/11/2022]
Abstract
Multipurpose sugars: Carbohydrate-derived silane reagents are utilized as the reductant for nickel-catalyzed aldehyde-alkyne reductive coupling reactions and as the glycosyl donor for subsequent intramolecular glycosylation. The approach enables the assembly of the carbon-carbon framework and stereochemical features of an aglycone while simultaneously establishing the site of glycosylation.
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Affiliation(s)
- Katherine M Partridge
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroup
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Partridge KM, Bader SJ, Buchan ZA, Taylor CE, Montgomery J. A Streamlined Strategy for Aglycone Assembly and Glycosylation. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307680] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
A chemoselective method for the hydrosilylation of ketones has been developed, using the combination of triphenylsilane and a catalyst prepared from Ni(COD)2 and the simple N-heterocyclic carbene IMes. The most notable feature of this method is that free hydroxyls are largely unaffected, thus providing a simple one-step procedure for the conversion of hydroxyketones to mono-protected diols, wherein the protecting group is exclusively installed on the ketone-derived hydroxyl. The process is typically high yielding with both simple ketones and more complex hydroxyketone substrates.
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Affiliation(s)
- Marta L Lage
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, United States
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Bagley SW, Southers JA, Cabral S, Rose CR, Bernhardson DJ, Edmonds DJ, Polivkova J, Yang X, Kung DW, Griffith DA, Bader SJ. Synthesis of 7-Oxo-dihydrospiro[indazole-5,4′-piperidine] Acetyl-CoA Carboxylase Inhibitors. J Org Chem 2012; 77:1497-506. [DOI: 10.1021/jo202377g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Scott W. Bagley
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - James A. Southers
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Shawn Cabral
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Colin R. Rose
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - David J. Bernhardson
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - David J. Edmonds
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Jana Polivkova
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Xiaojing Yang
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Daniel W. Kung
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - David A. Griffith
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Scott J. Bader
- Pfizer Worldwide Research & Development, Eastern Point Road, Groton, Connecticut 06340, United States
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Buchan ZA, Bader SJ, Montgomery J. Ketone hydrosilylation with sugar silanes followed by intramolecular aglycone delivery: an orthogonal glycosylation strategy. Angew Chem Int Ed Engl 2009; 48:4840-4. [PMID: 19492383 DOI: 10.1002/anie.200901666] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Gettin' a little sugar-no alcohol required: A procedure for the direct glycosylation of ketones without a hydroxy intermediate enables the site-selective glycosylation of hydroxyketones at the ketone or the alcohol functionality without the use of protecting groups on the aglycone (see scheme). Site selectivity is controlled by the catalyst structure in hydrosilylation and dehydrogenative silylation reactions with sugar silanes. Bn=benzyl.
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Affiliation(s)
- Zachary A Buchan
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA
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Abstract
The regio- and stereoselectivity of intramolecular [2 + 2] photocycloadditions of 2'-hydroxyenones are shown to be solvent-dependent. In the presence of aprotic solvents, 2'-hydroxyenones undergo photocycloadditions in a manner consistent with the presence of an intramolecular hydrogen bond between the carbonyl group and the tether's hydroxy functionality. In protic solvents, intermolecular interactions appear to disrupt the intramolecular hydrogen bond, providing products with complementary diastereoselectivity. If the facial accessibility of the alpha-tethered olefin is limited, the cycloadditions proceed to give head-to-tail or head-to-head regioisomers, depending on the nature of the solvent employed.
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Affiliation(s)
- Stephanie M Ng
- Department of Chemistry, Merkert Chemistry Center, Boston College, 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, USA
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Kantchev EAB, Bader SJ, Parquette JR. Oligosaccharide synthesis on a soluble, hyperbranched polymer support via thioglycoside activation. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.06.101] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bader SJ, Snapper ML. Intramolecular [2 + 2] Photocycloaddition/Thermal Fragmentation: Formally “Allowed” and “Forbidden” Pathways toward 5−8−5 Ring Systems. J Am Chem Soc 2005; 127:1201-5. [PMID: 15669859 DOI: 10.1021/ja044542i] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The thermal fragmentation of highly functionalized, linear polycyclobutanes with a cis,syn,cis-relative stereochemistry is shown to offer a rapid entry into the dicyclopenta[a,d]cyclooctenyl (5-8-5) ring system. The thermolysis of polyfused cyclobutanes with a cis,syn,cis- or a cis,anti,cis-relationship proceeds in a formally "symmetry-allowed" manner through the intermediacy of a cis,trans-cyclooctadiene. When a bridging tether used to establish the cis,syn,cis-stereochemistry in the intramolecular [2 + 2] photocyclization is present in the thermolysis step, however, the result of a formally "symmetry-forbidden" fragmentation is observed yielding cis,cis-cyclooctadiene-containing 5-8-5 products. In general, the stereochemical observations noted in these fragmentations offer new opportunities for accessing a variety of stereochemical relationships in these 5-8-5 ring systems.
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Affiliation(s)
- Scott J Bader
- Department of Chemistry, Merkert Chemistry Center, Boston College, 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, USA
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