New Addition Reactions of Organometal Compounds with 4,4-Dimethyl-1,3-thiazole-5(4H)-thiones
作者:Junxing Shi、Heinz Heimgartner
DOI:10.1002/hlca.19960790206
日期:1996.3.20
Addition reactions of organometallic reagents with 4,4-disubstituted 1,3-thiazole-5(4H)-thiones were studied. Whereas the reactions with alkyllithium and alkyl Grignardreagents occurred in the thiophilic manner, the carbophilic addition was observed with allyllithium and allyl Grignardreagents. A radicalreactionmechanism is proposed for rationalizing these observations (Scheme 5). A radical cyclization
reacted only when catalyzed with Rh2(OAc)4, and, in contrast to the previous reactions, the benzoyl-substitutedthiirane derivative 5a was the sole product (Scheme 4). Both types of reaction were observed with α-diazo amides 1d,e (Schemes 5–7). It is worth mentioning that formation of 1,3-oxathiole or thiirane is not only dependent on the type of the carbonyl compound 2 but also on the α-diazo amide
Regioselective 1,3-Dipolar Cycloadditions of Thiocarbonyl Ylides with 1,3-Thiazole-5(4H)-thiones
硫羰基内酯与1,3-噻唑-5(4 H)-硫酮的区域选择性1,3-偶极环加成反应
Eine neue 1,3-Oxathiolan-Synthese: Spirocyclische 1,3-Oxathiolane aus der<i>Lewis</i>-Säure katalysierten Umsetzung von 1,3-Thiazol-5(4<i>H</i>)-thionen mil Oxiranen
作者:Peter-Claus Tromm、Heinz Heimgartner
DOI:10.1002/hlca.19900730825
日期:1990.12.12
A New 1,3-Oxathiolane Synthesis: Spirocyclic 1,3-Oxathiolanesfrom the Lewis-Acid-Catalyzed Reaction of 1,3-Thiazole-5(4H)-thiones and Oxiranes