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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

New Nucleophilic Organocatalysts

Harris, David T. January 2011 (has links)
Acyl-transfer reactions have become commonplace in organic synthesis and organocatalysis of these reactions is becoming increasingly popular. 4-Dimethylaminopyridine has proven to be very useful in acylations; over the recent years chiral and more reactive analogs have received much attention. Interestingly, catalysis of acyl-transfers by diamines has also been shown to be effective. We present the synthesis of several DMAP analogs containing heteroatoms near the nucleophilic nitrogen. These analogs of DMAP vary from basic amidines, oxazolines, and amines, to alcohols, and fluoro-derivatives all of which may provide hydrogen bonding to the alcohol undergoing acyl-transfer. Since Steglich proposed the need for a base in the DMAP catalyzed acyl-transfer transition state no studies have been performed on the effect that nearby hydrogen bonding or nearby bases might have on catalytic efficiency and enantioselectivity of acylations. The variety of compounds synthesized should allow for studies into rate and selectivity enhancements in nucleophilic pyridine catalysis.

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