63906-63-8Relevant articles and documents
Predictable stereoselective and chemoselective hydroxylations and epoxidations with P450 3A4
Larsen, Aaron T.,May, Erin M.,Auclair, Karine
supporting information; experimental part, p. 7853 - 7858 (2011/06/26)
Enantioselective hydroxylation of one specific methylene in the presence of many similar groups is debatably the most challenging chemical transformation. Although chemists have recently made progress toward the hydroxylation of inactivated C-H bonds, enzymes such as P450s (CYPs) remain unsurpassed in specificity and scope. The substrate promiscuity of many P450s is desirable for synthetic applications; however, the inability to predict the products of these enzymatic reactions is impeding advancement. We demonstrate here the utility of a chemical auxiliary to control the selectivity of CYP3A4 reactions. When linked to substrates, inexpensive, achiral theobromine directs the reaction to produce hydroxylation or epoxidation at the fourth carbon from the auxiliary with pro-R facial selectivity. This strategy provides a versatile yet controllable system for regio-, chemo-, and stereoselective oxidations at inactivated C-H bonds and demonstrates the utility of chemical auxiliaries to mediate the activity of highly promiscuous enzymes.
Analogue of Coffeine and Theophylline: Effect of Structural Alterations on Affinity at Adenosine Receptors
Daly, J. W.,Padgett, W. L.,Shamim, M. T.
, p. 1305 - 1308 (2007/10/02)
A variety of analogues of caffeine and theophylline in which the 1-, 3-, and 7-methyl substituents have been replaced with n-propyl, allyl, propargyl, and isobutyl and, in few cases with chloroethyl, hydroxyethyl, or benzyl were assessed for potency and s
