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Rekha, Sharma S, Singh G, Vijaya Anand R. Tropylium Salt-Promoted Vinylogous Aza-Michael Addition of Carbamates to para-Quinone Methides: Elaboration to Diastereomerically Pure α,α'-Diarylmethyl Carbamates. ACS ORGANIC & INORGANIC AU 2021; 2:186-196. [PMID: 36855457 PMCID: PMC9954356 DOI: 10.1021/acsorginorgau.1c00033] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Carbocation catalysis is emerging as an important subarea of Lewis acid catalysis. Some stable and isolable carbocations have been successfully utilized as Lewis acid catalysts and promoters in many synthetic transformations. In this manuscript, we report a tropylium cation-promoted vinylogous aza-Michael addition of carbamates to para-quinone methides (QMs) to access a wide range of unsymmetrical α,α'-diarylmethyl carbamates. This mild protocol was effective for the vinylogous conjugate addition of (-)-menthyl carbamate to p-QMs, and the respective diastereomerically pure α,α'-diarylmethyl carbamate derivatives could be obtained in excellent yields and diastereoselectivities (up to >20:1 de).
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Nambo M, Tahara Y, Yim JC, Crudden CM. Cu‐Catalyzed Desulfonylative Amination of Benzhydryl Sulfones. Chemistry 2019; 25:1923-1926. [PMID: 30450672 DOI: 10.1002/chem.201805638] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Masakazu Nambo
- Institute of Transformative Bio-Molecules (WPI-ITbM)Nagoya University Chikusa Nagoya 464–8602 Japan
| | - Yasuyo Tahara
- Institute of Transformative Bio-Molecules (WPI-ITbM)Nagoya University Chikusa Nagoya 464–8602 Japan
| | - Jacky C.‐H. Yim
- Institute of Transformative Bio-Molecules (WPI-ITbM)Nagoya University Chikusa Nagoya 464–8602 Japan
| | - Cathleen M. Crudden
- Institute of Transformative Bio-Molecules (WPI-ITbM)Nagoya University Chikusa Nagoya 464–8602 Japan
- Department of ChemistryQueen's University Chernoff Hall Kingston Ontario K7L 3N6 Canada
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Dai C, Genovino J, Bechle BM, Corbett MS, Huh CW, Rose CR, Sun J, Warmus JS, Blakemore DC. One-Pot Synthesis of α-Branched N-Acylamines via Titanium-Mediated Condensation of Amides, Aldehydes, and Organometallics. Org Lett 2017; 19:1064-1067. [PMID: 28199125 DOI: 10.1021/acs.orglett.7b00082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A three-component, titanium-mediated synthesis of α-branched N-acylamines from commercial or readily accessible amides, aldehydes, and organometallic reagents is reported. The transformation proceeds under mild reaction conditions and tolerates a variety of functional groups (including nitrile, carbamate, olefin, basic amine, furan, and other sensitive heteroaromatics) to generate a large umbrella of α-branched N-acylamine products in high yields. The operationally practical procedure enables the use of this method in parallel chemical synthesis, a valuable feature that can facilitate the screening of bioactive molecules by medicinal chemists.
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Affiliation(s)
- Chunhui Dai
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Julien Genovino
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Bruce M Bechle
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Matthew S Corbett
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Chan Woo Huh
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Colin R Rose
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Jianmin Sun
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - Joseph S Warmus
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
| | - David C Blakemore
- Neuroscience and Pain and ‡Cardiovascular, Endocrine, and Metabolic Diseases, Pfizer Worldwide Medicinal Chemistry , Eastern Point Road, Groton, Connecticut 06340, United States
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Neelarapu R, Petukhov PA. A One-Pot Selective Synthesis of N-Boc Protected Secondary Amines: Tandem Direct Reductive Amination/N-Boc Protection. Tetrahedron 2012; 68:7056-7062. [PMID: 22844160 DOI: 10.1016/j.tet.2012.06.055] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
A one-pot tandem direct reductive amination of aldehydes with primary amines resulting in N-Boc secondary amines using a (Boc)(2)O/sodium triacetoxyborohydride (STAB) system is reported. The tandem procedure is efficient, selective, and versatile, giving excellent yields of N-Boc protected secondary amines even in those cases where the products are prone to intramolecular lactamization.
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Affiliation(s)
- Raghupathi Neelarapu
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, 833, S. Wood Street, Chicago, IL-60612, USA
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