Bile acids. LXXIX. synthesis and reduction of 1,4-dien-3-ones of various bile acids
作者:Mohammed N. Iqbal、William H. Elliott
DOI:10.1016/0039-128x(89)90022-6
日期:1989.3
bile acids (IIa-d), their methyl esters (IIe-h), and their formylated derivatives (IIi-k) were synthesized and their reduction investigated by both catalytic and chemical methods as an alternative route to the synthesis of allo bile acids. Lithium-ammonia reduction proved to be the better method for the reduction of these 1,4-dien-3-ones producing the 3-keto- and 3 beta-hydroxy-allo bile acids (Vb-d)
New cholic acid based calix[4]pyrroles and porphyrins were prepared and their properties were studied. It was confirmed by spectral measurements that the superassembly of 5, 15-bis(3 alpha, 7 alpha, 12 alpha-trihydroxy-5 beta-cholan-24-yl)-10,20-diphenylporphyrin, the best candidate for this study from the conjugates prepared, may be influenced not only by the solvent mixture composition (polar/non-polar component ratio) but by time as well. (c) 2012 Elsevier Inc. All rights reserved.
A New Generation of “Cholaphanes”: Steroid-Derived Macrocyclic Hosts with Enhanced Solubility and Controlled Flexibility
作者:Khadga M. Bhattarai、Anthony P. Davis、Justin J. Perry、Christopher J. Walter、Stephan Menzer、David J. Williams
DOI:10.1021/jo971272w
日期:1997.11.1
such as carbohydrates in nonpolar media. New features are the externally directed alkyl chains, promoting solubility in organic solvents, and (in the case of 3b/c) reduced conformational freedom resulting from truncation of the steroidal side-chain. In particular, modeling shows that the smallest macrocycle 3c possesses very little flexibility, preferring an open conformation which is also revealed in