pattern of the reactant. Inter alia they undergo surprising tandem sigmatropic rearrangements and cycloadditions. Three heretofore unknown product types were isolated and fully characterized: 6,7-dithiabicyclo[3.1.1]heptan-2-one 6-oxide derivatives, two isomeric 1,2-dithiete 1,1-dioxides (α,β-unsaturated four-membered cyclic thiosulfonates) from bis(propargyloxy) disulfides with α- or γ-alkyl-substituted
Tandem sigmatropic rearrangements and cyclizations of propargylic dialkoxy disulfides
作者:Samuel Braverman、Tatiana Pechenick、Hugo E Gottlieb
DOI:10.1016/s0040-4039(02)02653-9
日期:2003.1
The first successful preparation of propargylic dialkoxy disulfides in high yields is reported. These esters afforded novel 6,7-dithiabicyclo[3.1.1]heptane-2-one 6-oxide derivatives via an unprecedented sequence of three [2,3]- and one [3,3]-sigmatropic shifts followed by an intramolecular [2+2] cycloaddition. The latter are structurally related to the zwiebelanes, recently isolated from freshly cut
A Practical Synthesis of Mixed Allyl and Allenesulfinates
作者:Samuel Braverman、Tatiana Pechenick
DOI:10.1055/s-2003-41038
日期:——
by treatment of symmetrical dialkoxy disulfides (ROSSOR) with alcohols at room temperature has been found. Subsequent spontaneous [2,3]-sigmatropic rearrangements of mixed sulfoxylates such as alkylallyl and alkyl propargyl sulfoxylates afford mixed alkylallyl and alkyl allenesulfinates in good yield. The latter are not readily available by other routes.