Thiocarbonyl ylides generated from A3-1 ,3,4-thiadiazolines &-5 by thermal extrusion of nitrogen undergo 1,3-dipolar cycloadditions with sulfur dioxide, giving 1,2,4-oxadithiolane 2-oxides k-5 in good yields.
A new strategy to sulfur heterocycles: Reactions of an allene episulfide with electrophiles
β Scribed by Wataru Ando; Toshiya Furuhata; Yukio Hanyu; Toshikazu Takata
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- French
- Weight
- 177 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0040-4039
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Silylcupration of allene using phenyldimethylsilyl-copper followed by conjugated addition to 0t,[3-unsaturated ketones affords oxoallylsilanes with different substitution patterns. When the former oxoailyisilanes are treated with a Lewis acid they undergo highly stereoselective allylsilane terminate
The reaction of heterocyclic enamioes with ethyl propiolate and diethyl acetylenedics&oxylate has been systematically studied. In contrast to their hetemcyclic ketene aminal analogues, heterocyclic enamines reacted with electrophilic e w'a the Michael addition pathway rather thao the aza-ene reactio