Chelation and Stereodirecting Group Effects on Regio- and Diastereoselective Samarium(II)-Water Allylic Benzoate Reductions
作者:Gregory W. O’Neil、Trevor F. Stockdale、Michael A. Leitch
DOI:10.1055/s-0039-1690826
日期:2020.5
SmI2(H2O)n reductions of allylic benzoates adjacent to a trisubstituted alkene occur in high yields with complete regioselectivity and good diastereoselectivity (up to 90:10) for substrates containing properly positioned stereodirecting- and chelating groups. The outcome of these reactions can be rationalized by ring conformation considerations of a proposed chelated organosamarium intermediate, and
Asymmetric Total Syntheses of (−)-α-Lycorane, (−)-Zephyranthine, and Formal Synthesis of (+)-Clivonine
作者:Yong-Jian Chen、Sen-Lin Cai、Chuan-Chuan Wang、Jin-Duo Cheng、Søren Kramer、Xing-Wen Sun
DOI:10.1002/asia.201700555
日期:2017.6.19
An asymmetric route to (−)-α-lycorane and (−)-zephyranthine, and a formal totalsynthesis of (+)-clivonine were achieved. A pivotal intermediate, which serves as a potent precursor for the divergent syntheses of these natural products, was accessed by a diastereoselective Pd-catalyzed cinnamylation of an N-tert-butanesulfinyl imine.
Certain chemical entities, compositions, and methods
申请人:Qian Xiangping
公开号:US20070219192A1
公开(公告)日:2007-09-20
Compounds useful for treating cellular proliferative diseases and disorders by modulating the activity of one or more mitotic kinesins are disclosed.
本发明揭示了用于通过调节一个或多个有丝分裂动力蛋白的活性来治疗细胞增殖性疾病和疾患的化合物。
WO2007/56143
申请人:——
公开号:——
公开(公告)日:——
On the structure of the Phytophthora α1 mating hormone: synthesis and comparison of four candidate stereoisomers
作者:Reena Bajpai、Fanglong Yang、Dennis P. Curran
DOI:10.1016/j.tetlet.2007.09.054
日期:2007.11
Two two-compound mixtures of candidate structures for the Phytophthora alpha 1 mating hormone have been synthesized. The mixtures were designed to have differing configurations at C3, but proved to be identical. This suggests that epimerization occurred at C3, and comparison with the data for the natural samples suggest that this is also a mixture of isomers. (c) 2007 Elsevier Ltd. All rights reserved.