115860-69-0Relevant articles and documents
Design and synthesis of Fmoc-SPPS-ready iodoarene amino acid pre-catalysts and their reactivity in the catalytic oxytosylation of ketones
Brummel, Beau R.,Giambalvo, Lauren N.,Gross, Kristopher G.,Kobra, Khadijatul,Lex, Timothy R.,McMillen, Colin D.,Panda, Soham,Pennington, William T.,Swasy, Maria I.,Whitehead, Daniel C.
supporting information, (2020/02/22)
A small suite of iodo-aryl amide containing amino acids were synthesized and assessed as catalysts for the hypervalent iodine(III) mediated α-oxytosylation of ketones. The efficiency of each catalyst was determined by comparing the relative rates of catalysis in the direct α-oxytosylation of propiophenone. In addition, these catalysts can be easily converted to congeners that are suitable for Fmoc-solid phase peptide synthesis for facile incorporation into a chiral peptide framework. This work facilitates the broader goal of our program to develop peptide-based enantioselective catalysts for hypervalent iodine chemistry.
Relative Rate Profiles of Functionalized Iodoarene Catalysts for Iodine(III) Oxidations
Lex, Timothy R.,Swasy, Maria I.,Whitehead, Daniel C.
, p. 12234 - 12243 (2016/01/09)
A series of rate studies were conducted to evaluate the steric and electronic properties that govern the reactivity of iodoarene amide catalysts in the α-oxytosylation of propiophenone. A meta-substituted benzamide catalyst emerged as the most reactive. This catalyst was employed in the α-oxytosylation of a series of substituted propiophenones, returning the α-tosyloxy ketone products in excellent isolated yield.
The enantioselective Birch-Cope sequence for the synthesis of carbocyclic quaternary stereocenters. Application to the synthesis of (+)-mesembrine
Paul, Tapas,Malachowski, William P.,Lee, Jisun
, p. 4007 - 4010 (2007/10/03)
A synthetic technique for generating carbocyclic quaternary stereocenters with exceptionally high levels of enantioselectivity is described. A sequence of three reactions, enantioselective Birch reduction-allylation, enol ether hydrolysis, and Cope rearrangement, is used to stereoselectively generate chiral quaternary centers on a 2-cyclohexen-1-one ring. The products of the sequence are 4,4-disubstituted-2-carboxamide-2-cyclohexen-1-one structures which are versatile intermediates in complex natural product synthesis. An application of the sequence to the synthesis of (+)-mesembrine illustrates the utility of these intermediates.