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Krow GR, Yu F, Sender M, Gandla D, Lin G, DeBrosse C, Ross CW. Introduction of C(5/6) side chains onto 2-azabicyclo[2.1.1]hexanes via a 6-anti-bromo-5-anti-hydroxy derivative. CAN J CHEM 2012. [DOI: 10.1139/v11-112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxidation of the title bromoalcohol provided the strained ketone, 5-bromo-6-oxo-2-azabicyclo[2.1.1]hexane. Additions of nucleophiles to either this or the debrominated ketone have been used to introduce 5(6)-syn-alkyl and aryl groups, 5(6)-alkylidene linkages, and 5(6)-anti-alkyl and acyl substituents. Facial selectivity is for additions to the 6-bromo-5-ketone and 5-alkylidene azabicycles to occur from the face syn to the nitrogen atom. The bromine atom of the title alcohol has also been replaced by a 6-anti-(1-hydroxyethyl) substituent using a directed radical addition process. The stereoselective functionalization reactions expand the range of available methano-bridged pyrrolidines.
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Affiliation(s)
- Grant R. Krow
- Department of Chemistry, Temple University, Philadelphia, PA 19122, USA
| | - Fang Yu
- Department of Chemistry, Temple University, Philadelphia, PA 19122, USA
| | - Matthew Sender
- Department of Chemistry, Temple University, Philadelphia, PA 19122, USA
| | - Deepa Gandla
- Department of Chemistry, Temple University, Philadelphia, PA 19122, USA
| | - Guoliang Lin
- Department of Chemistry, Temple University, Philadelphia, PA 19122, USA
| | - Charles DeBrosse
- Department of Chemistry, Temple University, Philadelphia, PA 19122, USA
| | - Charles W. Ross
- Department of Medicinal Chemistry, Merck Research Laboratories, Merck & Co., Inc., West Point, PA 19486-004, USA
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Casarini D, Lunazzi L, Mazzanti A. Steric effects which determine the conformational preferences and stereodynamic processes of aryl fluorenyl ketones. Org Biomol Chem 2009; 7:1619-26. [DOI: 10.1039/b822874d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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3
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Casarini D, Lunazzi L, Mazzanti A. Stereomutation of Conformational Enantiomers of 9-Isopropyl-9-formylfluorene and Related Acyl Derivatives. J Org Chem 2008; 73:6382-5. [DOI: 10.1021/jo8008897] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniele Casarini
- Department of Chemistry, University of Basilicata, via N. Sauro 85, Potenza 85100, Italy, and Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, Bologna 40136, Italy
| | - Lodovico Lunazzi
- Department of Chemistry, University of Basilicata, via N. Sauro 85, Potenza 85100, Italy, and Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, Bologna 40136, Italy
| | - Andrea Mazzanti
- Department of Chemistry, University of Basilicata, via N. Sauro 85, Potenza 85100, Italy, and Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, Bologna 40136, Italy
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Abdelrahman D, Benn M, Hellyer R, Parvez M, Edwards OE. Some oxidation products of lycoctonine revisited. CAN J CHEM 2006. [DOI: 10.1139/v06-144] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The structure of a chromic acid oxidation product of the norditerpenoid alkaloid lycoctonine (1) was established as hydroxylycoctonal (3) by spectrometric analyses and X-ray crystallography of its reduction product, hydroxylycoctonine (5); the structure of lycoxonine, a chromic acid oxidation product of the lactam, lycoctonam (7), was similarly confirmed as N-ethyl-4,7,8-trihydroxy-1α,6β,14α,16β-tetramethoxy-19-oxoaconitane (8). Reduction of lycoxonine with lithium aluminium hydride gave the 1,14-di-O-methyl ether (12) of the bisnorditerpenoid alkaloid delbine (9).Key words: norditerpenoid, bisnorditerpenoid, alkaloids, lycoctonine, lycoctonam, hydroxylycoctonal, lycoxonine. 1,14-di-O-methyldelbine, semisynthesis.
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5
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Kirmse W, Brandt S. Desaminierungsreaktionen, 40. Zerfall von 3,3‐, 5,5‐ und 7,7‐Dimethyl‐2‐norbornan‐diazonium‐Ionen. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19841170722] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Wolfgang Kirmse
- Abteilung für Chemie der Ruhr‐Universität Bochum, Postfach 102148, D‐4630 Bochum 1
| | - Sigrid Brandt
- Abteilung für Chemie der Ruhr‐Universität Bochum, Postfach 102148, D‐4630 Bochum 1
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Müller P, Blanc J, Lenoir D. Steric Effects on Reaction Rates - III. Application of Force-Field Calculations to Chromic Acid Oxidation of Alcohols. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19820650410] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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8
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Böhrer G, Knorr R, Böhrer P, Schubert B. Sterically Congested Molecules, 17. – Novel Syntheses of α,α,β-Tri-tert-butyl Compounds. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jlac.199719970128] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Attygalle AB, Xu SC, McCormick KD, Meinwald J, Blankespoor CL, Eisner T. Alkaloids of the Mexican Bean Beetle, Epilachna varivestis (Coccinellidae). Tetrahedron 1993. [DOI: 10.1016/0040-4020(93)80019-p] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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11
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Barton DH, Kitchin JP, Lester DJ, Motherwell WB, Papoula MTB. Functional group oxidation by pentavalent organobismuth reagents. Tetrahedron 1981. [DOI: 10.1016/0040-4020(81)85042-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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