Chemoselective Rearrangement Reactions of Sulfur Ylide Derived from Diazoquinones and Allyl/Propargyl Sulfides
作者:Sijia Yan、Junxin Rao、Cong-Ying Zhou
DOI:10.1021/acs.orglett.0c03493
日期:2020.11.20
three types of rearrangement reactions of sulfur ylidederivedfrom diazoquinones and allyl/propargyl sulfides. With Rh2(esp)2 as the catalyst, diazoquinones react with allyl/propargyl sulfides to form a sulfur ylide, which undergoes a chemoselective tautomerization/[2,3]-sigmatropic rearrangement reaction, a Doyle–Kirmse rearrangement/Cope rearrangement cascade reaction, or a Doyle–Kirmse rearrangement/elimination
Intermolecular Phosphite-Mediated Radical Desulfurative Alkene Alkylation Using Thiols
作者:John M. Lopp、Valerie A. Schmidt
DOI:10.1021/acs.orglett.9b03018
日期:2019.10.4
report herein the development of a S atom transfer process using triethylphosphite as the S atom acceptor that allows thiols to serve as precursors of C-centered radicals. A range of functionalized and electronically unbiased alkenes including those containing common heteroatom-based functional groups readily participate in this reductive coupling. This process is driven by the exchange of relatively
Novel Glucocorticoid Antedrugs Possessing a 17β-(γ-Lactone) Ring
作者:Panayiotis A. Procopiou、Keith Biggadike、Alan F. English、Rosanne M. Farrell、Graham N. Hagger、Ashley P. Hancock、Michael V. Haase、Wendy R. Irving、Meenu Sareen、Michael A. Snowden、Yemisi E. Solanke、Cathy J. Tralau-Stewart、Sarah E. Walton、Jenny A. Wood
DOI:10.1021/jm001035c
日期:2001.2.1
butyrolactones linked to the steroidal nucleus via the beta-position were more potent glucocorticoid agonists than those linked through the alpha-position of the lactone. The most potent compounds were also shown to be stable in human lung S9 fraction, showed much lower systemic effects than budesonide in the thymus involution test, and possessed topicalantiinflammatoryactivity in the rat ear edema model
21-(2-oxo-tetrahydrofuran)-thio pregnane derivatives, a process for
申请人:Glaxo Wellcome Inc.
公开号:US06013244A1
公开(公告)日:2000-01-11
Compounds of the pregnane series are described having general formula (I) or their solvates in which R.sub.1 individually represents --OC(.dbd.O)C.sub.1-6 alkyl; R.sub.2 individually represents hydrogen, methyl (which may be in the .alpha. or .beta. configuration) or methylene; or R.sub.1 and R.sub.2 together represent formula (a) where R.sub.5 and R.sub.6 are the same or different and each represents hydrogen or C.sub.1-6 alkyl; R.sub.3 and R.sub.4 are the same or different and each represents hydrogen or halogen; and represents a single or a double bond. Compounds of formula (I) and their solvates are useful as anti-inflammatory or anti-allergic agents. ##STR1##
Novel glucocorticoid antedrugs possessing a 21-(γ-lactone) ring
作者:Richard M. Angell、Keith Biggadike、Rosanne M. Farrell、Stephen S. Flack、Ashley P. Hancock、Wendy R. Irving、Sean M. Lynn、Panayiotis A. Procopiou
DOI:10.1039/b200190j
日期:2002.3.8
A series of novel pregnane derivatives bearing γ-butyrolactones at C21 were prepared and tested as glucocorticoid agonists. The compounds were also tested for their lability in human plasma, and found to be rapidly hydrolysed by the enzyme paraoxonase to the respective hydroxyacids.