OXIDATIVE COUPLING OF KETENE DITHIOACETALS WITH SILYLATED CARBON NUCLEOPHILES BY THE USE OF TRITYL TETRAFLUOROBORATE
作者:Yukihiko Hashimoto、Teruaki Mukaiyama
DOI:10.1246/cl.1986.755
日期:1986.5.5
2-Alkenyl-1,3-dithiolan or dithian-2-ylium cations are yielded by hydride abstraction of cyclic ketene dithioacetals with trityl tetrafluoroborate. These cations react with silyl enol ethers or an allylsilane completely regioselectively to give the corresponding functionalized ketene dithioacetals.
Nucleophile Acylierung mit 2-Lithium-1,3-dithianen bzw. -1,3,5-trithianen<sup>1,2,3</sup>
作者:D SEEBACH
DOI:10.1055/s-1969-34190
日期:——
Preparative aspects of the chemistry of 2-lithium-1,3-dithianes and 2-lithium-1,3,5-trithianes are surveyed. In particular, nucleophillic acylation reactions using the mentioned lithium derivatives are discussed.
Relative reactivity of 2-diphenylphosphinoyl- and 2-diphenyl-thiophosphinoyl-2-[1,3]dithianyllithium as reagents wittig-horner/corey-seebach
作者:Eusebio Juaristi、Barbara Gordillo、Lucia Valle
DOI:10.1016/s0040-4020(01)87612-2
日期:1986.1
The reaction of the title carbanions with several aldehydes and ketones to afford the corresponding ketene dithioketals was studied. It was found that the PO organolithium reagent reacted with both types of carbonyl substrates in good to excellent yields. On the other hand, the PS reagent reacted selectively with aldehydes although in poor yield. This contrasting behavior can not be ascribed to a
Highly Enantioselective Oxidations of Ketene Dithioacetals Leading to Trans Bis-sulfoxides
作者:Varinder K. Aggarwal、Rebecca M. Steele、Ritmaleni、Juliet K. Barrell、Ian Grayson
DOI:10.1021/jo034032r
日期:2003.5.1
Sharpless-type asymmetric oxidation using (+)-DET, Ti(O(i)()Pr)(4), and cumene hydroperoxide to give the trans bis-sulfoxides 4a-f with essentially complete control of enantioselectivity and diastereoselectivity. The high enantioselectivity is a consequence of carrying out two asymmetric processes on the same substrate. However, this should lead to the formation of a small amount of the meso isomer but none was