期刊
HELVETICA CHIMICA ACTA
卷 103, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.202000175
关键词
alkynes; catalysis; cobalt; cycloaddition; cyclohexadiene; fragrance chemistry
A low-valent cobalt(I) complex, formed from the reduction of CoBr2(dppe) with zinc, acts as catalyst for the efficient [2+4] cycloaddition of beta-alkyl, cycloalkyl and aryl substituted propiolates to dienes. This transformation yields synthetically relevant 1,4-cyclohexadiene carboxylates in good to excellent yields. Furthermore, the target compounds are novel lead structures for the discovery of fragrance ingredients from the fruity, floral and spicy odor family.
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