Discovery of Deep-Seated Skeletal Rearrangements in the Photocyclizations of Some tert-Butyl-Substituted 1,2-Diarylethylenes
摘要:
The in-solution oxidative photocyclization of stilbenes to phenanthrenes is a well-known and synthetically valuable reaction. We report here our discovery that the oxidative photocyclization of several tert-butyl-substituted 1-styrylphenanthrenes resulted not only in the expected formation of tert-butyl-substituted picenes but also in the previously unknown rearrangement leading to the formation of tert-butyl-substituted pentahelicenes.
Discovery of Deep-Seated Skeletal Rearrangements in the Photocyclizations of Some tert-Butyl-Substituted 1,2-Diarylethylenes
摘要:
The in-solution oxidative photocyclization of stilbenes to phenanthrenes is a well-known and synthetically valuable reaction. We report here our discovery that the oxidative photocyclization of several tert-butyl-substituted 1-styrylphenanthrenes resulted not only in the expected formation of tert-butyl-substituted picenes but also in the previously unknown rearrangement leading to the formation of tert-butyl-substituted pentahelicenes.
SAR studies on the central phenyl ring of substituted biphenyl oxazolidinone-potent CETP inhibitors
作者:Zhijian Lu、Yi-heng Chen、Joann B. Napolitano、Gayle Taylor、Amjad Ali、Milton L. Hammond、Qiaolin Deng、Eugene Tan、Xinchun Tong、Suoyu S. Xu、Melanie J. Latham、Laurence B. Peterson、Matt S. Anderson、Suzanne S. Eveland、Qiu Guo、Sheryl A. Hyland、Denise P. Milot、Ying Chen、Carl P. Sparrow、Samuel D. Wright、Peter J. Sinclair
DOI:10.1016/j.bmcl.2011.11.039
日期:2012.1
SAR studies of the substitution effect on the central phenyl ring of the biphenyl scaffold were carried out using anacetrapib (9a) as the benchmark. The results revealed that the new analogs with substitutions to replace trifluoromethyl (9a) had a significant impact on CETP inhibition in vitro. In fact, analogs with some small groups were as potent or more potent than the CF3 derivative for CETP inhibition
A carbon–carbon (C–C) singlebond longer than 1.7 Å shows unique bond flexibility, even though a C–C singlebond is typically rigid and robust. We report here that the bond length of flexible C–C single bonds surrounded by bulky alkyl groups in novel hexaphenylethane-type hydrocarbons might be affected by weak noncovalent interactions, such as London dispersion. Thanks to London dispersion, an ultralong
Design of a novel class of biphenyl CETP inhibitors
作者:Zhijian Lu、Joann B. Napolitano、Ashleigh Theberge、Amjad Ali、Milton L. Hammond、Eugene Tan、Xinchun Tong、Suoyu S. Xu、Melanie J. Latham、Laurence B. Peterson、Matt S. Anderson、Suzanne S. Eveland、Qiu Guo、Sheryl A. Hyland、Denise P. Milot、Ying Chen、Carl P. Sparrow、Samuel D. Wright、Peter J. Sinclair
DOI:10.1016/j.bmcl.2010.10.019
日期:2010.12
A new class of CETP inhibitors was designed and prepared. These compounds are potent both in vitro and in vivo. The most active compound (12d) has shown an ability to raise HDL significantly in transgenic mouse PD model. (C) 2010 Elsevier Ltd. All rights reserved.