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J Leitich 《Tetrahedron letters》1980,21(32):3025-3028
The relative rates of formation of and [2+2]cycloadducts of benzyne to , - and , -1,5-cyclooctadiene, - and -cyclooctene are discussed and properties of the adducts (e.g., their unusual hydrogenation) are described. 相似文献
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A stereospecific, highly efficient, generally applicable synthesis of - and -1-alkoxy-1,3-butadienes involving dehydrative decarboxylations of 4,5-unsaturated-2-alkoxy-3-hydroxy-carboxylic acids is described. 相似文献
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Intramolecular DIELS-ALDER reactions of requisite trienes led to -1-decalones, an endo intermediate state. 相似文献
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Condensation of aldehydes with Zr enolate of chiral -propionyl--2,5-disubstituted pyrrolidine proceeded with high diastereo- and diastereoface-selection. Stereoselectivity in the reaction of the corresponding -acetyl compounds was also examined. 相似文献
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A stereospecific route to -2,2-dimethyl-3-alkenyl-cyclopropanecarboxylic Acids is illustrated by a total synthesis of (±)--Chrysanthemic Acid (11). The key step consists of an alicyclic Claisen rearrangement of -silyl enolates derived from appropriately substituted ()-4-hexen-6-olides [e.g.(9)]. 相似文献
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Methods are described for the stereospecific conversion of hydrindenone 3 either to the corresponding fused or fused hydrindanone (1 or 2, respectively.) 相似文献