Gold-Catalyzed Carbene Transfer to Alkynes: Access to 2,4-Disubstituted Furans
作者:Søren Kramer、Troels Skrydstrup
DOI:10.1002/anie.201200307
日期:2012.5.7
example of a gold‐catalyzed intermolecular addition of carbon ylides to terminal alkynes is reported (see scheme; DCE=dichloroethane, Tf=trifluoromethanesulfonyl). Subsequent intramolecular trapping of the generated gold carbene completes a formal [3+2] cycloaddition, which represents a novel synthesis of 2,4‐disubstituted furans.
2-Phenyl-3-aroylbenzothiophenes useful as antifertility agents
申请人:Eli Lilly and Company
公开号:US04133814A1
公开(公告)日:1979-01-09
Derivatives of 2-phenyl-3-aroylbenzothiophenes and 2-phenyl-3-aroylbenzothiophene-1-oxides are useful as antifertility agents. Certain of these compounds also are useful in suppressing the growth of mammary tumors.
1] cycloaddition of propargylic carbamates and sulfur ylides was successfully developed. This strategy led to a series of chiral indolines with synthetically flexible alkyne groups in good yields and with high enantio- and diastereoselectivities (up to 99% yield, 98% ee, and >95:5 dr). A possible mechanism and stereoinduction mode with copper-allenylidenes were proposed as the possible dipolar intermediate
An efficient preparation for arylethynyl sulfides 1 and bis(arylethynyl) sulfides 2 has been accomplished through a one-pot, three-step strategy that starts from arylethanonyl sulfides and bis(arylethanonyl) sulfides, respectively, without the use of various terminal arylacetylenes as substrates. When lithium hexamethyldisilazane (LHMDS), ClP(O)(OEt)2, and LHMDS were sequentially added to a tetrahydrofuran
The toxicity of organic sulphides to the eggs and larvae of the glasshouse red spider mite. II.—miscellaneous sulphides
作者:R. F. Brookes、J. E. Cranham、D. Greenwood、H. A. Stevenson
DOI:10.1002/jsfa.2740081003
日期:1957.10
The activities against the eggs and young mites of the glasshouseredspider (Tetranychus telarius L.) shown by a number of compounds, all containing two benzene nuclei linked by various sulphur-containing bridges, are tabulated and discussed.
列出并讨论了许多化合物对温室红蜘蛛 (Tetranychus telarius L.) 的卵和幼螨的活性,这些化合物均包含通过各种含硫桥连接的两个苯核。