3-dipolar cycloadditions have appeared to be a fertile area for research, as attested by the numerous synthetic transformations and resulting applications that have been developed during the past 60 years, the use of neutral three-atom components (TACs) in (3+2) cycloadditions remains comparatively sparse. Neutral TACs, however, have great synthetic potential given that their reaction with a π system
Preparation of substituted transition-metal (η1-propargyl complexes and their [3+2] cycloaddition reactions with sulfur dioxide and disulfur monoxide. Transition-metal–carbon bond cleaving reactions of the cycloadducts which yield oxathiolene oxides and dithiolene oxides
作者:Elizabeth E Scott、Erling T Donnelly、Mark E Welker
DOI:10.1016/s0022-328x(03)00167-0
日期:2003.4
The preparations of several new cyclopentadienyl iron dicarbonyl η1-2-alkynyl complexes are reported. Their [3+2] cycloaddition reactions with sulfurdioxide and disulfur monoxide yielded transition-metal substituted 1,2-oxathiolene-2-oxides and 1,2-dithiolene-1-oxides, respectively. The transition-metal was cleaved from the oxathiolene-oxide and dithiolene-oxide containing complexes to produce new
Five member ring sulfenate esters and thiosulfinate esters
申请人:Wake Forest University
公开号:US06242478B1
公开(公告)日:2001-06-05
Disclosed are novel sulfenate esters and thiosulfinate esters that induce the expression of metabolic enzymes, particularly Phase II enzymes such as glutathione-s-transferase, DT-diaphorase and Ferritin H when administered to a subject. Also disclosed, such compounds are effective to displace a zinc ion from retroviral zinc finger nucleocapsid proteins effective to inhibit HIV replication. The present invention is further directed to novel methods of making these compounds, and any compounds produced by the process of making these novel compounds.
Alkynyl sulfides were shown to participate in thermal (3+2) cycloadditions with tethered alkynes. The resulting thiophenium ylide cycloadducts led to a variety of polysubstituted thiophenes by trapping with diverse electrophiles.