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2005
Cycloaddition reactions
O 0070
[3 + 2]-Cycloaddition Reactions of Thioisatin with L-Proline and (R)-(-)-Thiapro— Reactions of 5-methylthioisatin (I) with the prolines (II) lead to the spiro oxa18- 034 line.
zolidinone (IIIa) and thiazolidinone (IIIb) derivatives, respectively. When the same reactions are carried out in the presence of the acetylenic dipolarophiles (IV), spiro cycloadducts (V) are obtained. The stereochemical aspects of these reactions are ascertained using semiempirical calculations. — (PARDASANI*, R. T.; PARDASANI, P.;
SHARMA, I.; LONDHE, A.; GUPTA, B.; Phosphorus, Sulfur Silicon Relat. Elem.
179 (2004) 12, 2549-2560; Dep. Chem., Univ. Rajasthan, Jaipur 302 004, India;
Eng.) — H. Haber
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