Alkyl- and arylsubstituted ketenedithioacetal tetroxides: Diels-alder reactivity and reductive desulfonylation of the adducts
作者:Ottorino De Lucchi、Davide Fabbri、Vittorio Lucchini
DOI:10.1016/s0040-4020(01)92236-7
日期:1992.2
M lithium perchlorate under sonication. Under these reaction conditions, the cycloaddition to quadricyclane, 1-methoxy-, 1- and 2-trimethylsilyloxy-1,3-butadiene and to the Danishefsky diene were investigated. In the cycloaddition to 1-trimethylsilyloxy-1,3-butadiene and to the Danishefsky diene the open chain adducts (Z)- 14 and 17 were obtained in high yield as primary adducts. Eventually, the former
Synthetic equivalents to substituted acetylenes in cycloaddition reactions. Dienophilic reactivity of 2-methyl-, 2-phenyl- and 2,3-trimethylene-1,4-benzodithiins-1,4-tetroxides
作者:Andrea Giacometti、Ottorino De Lucchi、Francisco Dilillo、Sergio Cossu、Karl Peters、Eva-Maria Peters、Hans G. von Schnering
DOI:10.1016/s0040-4020(01)85275-3
日期:1994.1
(3c) have been prepared with different methods starting from benzene-1,2-dithiol (1). Their reactivity was tested towards cyclopentadiene, sulfolene, furan and 1,3-cyclohexadiene. The Diels-Alder adducts to cyclopentadiene were converted into the corresponding unsaturated hydrocarbons, mimicking the Diels-Alder reaction of substituted acetylenes. The X-ray structure determinations of 4b, a secondary
Bis(tert-butylsulfonyl)acetylene as a general synthetic equivalent of alkynes in diels-alder chemistry. II: reductive and alkylative desulfonylations of bicyclic 1-alkyl-2-(tert-butylsulfonyl)ethenes
作者:Marina Virgili、Jordi Belloch、Albert Moyano、Miguel A. Pericàs、Antoni Riera
DOI:10.1016/0040-4039(91)80045-8
日期:1991.1
Both reductive and alkylativedesulfonylations of bicyclic vinyl sulfones derived from Diels-Alder cycloadducts of bis(-butylsulfonyl)acetylene (1) are described. These transformations establish the synthetic equivalence of 1 with acetylene, 1-alkynes and internal alkynes in Diels-Alderchemistry.
Borylated norbornadiene derivatives: Synthesis and application in Pd-catalyzed Suzuki–Miyaura coupling reactions
作者:Robin Schulte、Heiko Ihmels
DOI:10.3762/bjoc.18.41
日期:——
this context there is still the need for new tailor-made derivatives, borylated norbornadienes were synthesized that may be used as versatile building blocks. Thus, the 4,4,5,5-tetramethyl-2-(bicyclo[2.2.1]heptadien-2-yl)-1,3,2-dioxaborolane was prepared and shown to be a suitable substrate for Pd-catalyzed Suzuki–Miyaura coupling reactions with selected haloarenes. It was demonstrated exemplarily