Our major objectives for the second year of the grant will be to delineate the scope and limitations of our recently documented inter- and intramolecular (4+2)-cycloaddition of nitroalkenes with unactivated olefins. Our initial studies have demonstrated a high degree of stereocontrol in the formation of six-membered rings. We intend to address the flexibility of the reaction in creation of four, five, seven and eight-membered rings by intramolecular cycloaddition. We propose to investigate-the incorporation of stereocenters and heteroatoms in the connecting chain between heterodiene and dienophile as well as on the heterodiene itself. The synthesis and utilization of nitrocycloalkenes of various sizes and degrees of functionalization is also planned. A second major objective is the demonstration of the tandem double- intramolecular (4+2) + (3+2)-cycloaddition originally proposed. We have demonstrated the feasibility of this reaction in the intra/intermolecular mode and will explore the parameters of second chain length and dipolarophilic activating group. Secondary goals include manipulation of the double cycloadducts and the products of (4+2)-cycloaddition from vinylnitrosonium cations. We have recently completed a successful study on the potential for transformations of the cyclic nitronates from cycloadditions of nitroolefins. Reductive, hydrolytic and carbon constructive processes are proposed for the unusual, saturated heterocyclic products. A tertiary goal is the exploration of the anion chemistry of nitronic esters and nitroalkenes. These highly oxidized functions should offer novel avenues for carbon-carbon bond formation due to their strong acidifying effects. The problems of regioselectivity, stereoselectivity and reactivity will be addressed.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM030938-09
Application #
3278818
Study Section
Medicinal Chemistry Study Section (MCHA)
Project Start
1982-08-01
Project End
1991-07-31
Budget Start
1990-08-01
Budget End
1991-07-31
Support Year
9
Fiscal Year
1990
Total Cost
Indirect Cost
Name
University of Illinois Urbana-Champaign
Department
Type
Schools of Arts and Sciences
DUNS #
041544081
City
Champaign
State
IL
Country
United States
Zip Code
61820
Denmark, Scott E (2018) Organic Synthesis: Wherefrom and Whither? (Some Very Personal Reflections). Isr J Chem 58:61-72
Denmark, Scott E; Matesich, Zachery D; Nguyen, Son T et al. (2018) Catalytic Nucleophilic Allylation Driven by the Water-Gas Shift Reaction. J Org Chem 83:23-48
Ibrahim, Malek Y S; Denmark, Scott E (2018) Selective extraction of supported Rh nanoparticles under mild, non-acidic conditions with carbon monoxide. J Mater Chem A Mater 6:18075-18083
Thomas, Andy A; Zahrt, Andrew F; Delaney, Connor P et al. (2018) Elucidating the Role of the Boronic Esters in the Suzuki-Miyaura Reaction: Structural, Kinetic, and Computational Investigations. J Am Chem Soc 140:4401-4416
Tao, Zhonglin; Robb, Kevin A; Panger, Jesse L et al. (2018) Enantioselective, Lewis Base-Catalyzed Carbosulfenylation of Alkenylboronates by 1,2-Boronate Migration. J Am Chem Soc 140:15621-15625
Barraza, Scott J; Denmark, Scott E (2018) Synthesis, Reactivity, Functionalization, and ADMET Properties of Silicon-Containing Nitrogen Heterocycles. J Am Chem Soc 140:6668-6684
Ibrahim, Malek Y S; Denmark, Scott E (2018) Palladium/Rhodium Cooperative Catalysis for the Production of Aryl Aldehydes and Their Deuterated Analogues Using the Water-Gas Shift Reaction. Angew Chem Int Ed Engl 57:10362-10367
Böse, Dietrich; Denmark, Scott E (2018) Investigating the Enantiodetermining Step of a Chiral Lewis Base Catalyzed Bromocycloetherification of Privileged Alkenes. Synlett 29:433-439
Tao, Zhonglin; Robb, Kevin A; Zhao, Kuo et al. (2018) Enantioselective, Lewis Base-Catalyzed Sulfenocyclization of Polyenes. J Am Chem Soc 140:3569-3573
Barraza, Scott J; Denmark, Scott E (2017) Unexpected Rearrangement of 2-Bromoaniline under Biphasic Alkylation Conditions. Synlett 28:2891-2895

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