Simple synthesis of?-silyloxyacylcyclopropanes and the homoallyl rearrangement of cyclopropylcarbinols by the action of trimethylsilyl halides in the presence of zinc halides
摘要:
The ZnCl2 catalyzed condensation of 1-trimethylsilyloxyvinylcyclopropane with aldehydes and ketones gave beta-silyloxyacylcyclopropanes, which were converted by the action of TsOH in boiling benzene into 1-cyclopropyl-2E-alken-1-ones. Reduction of the latter gave saturated and allyl cyclopropylcarbinols, which by means of Me3SiX and catalytic amounts of ZnX2 (X = Cl, Br) were highly selectively converted into the corresponding linear mono- and dienic E-homoallyl halides. The sequence of reactions that was worked out provided an effective synthesis of 3E-dodecenyl acetate, a sex pheromone of the sugar beet moth.
Generation and Intermolecular Capture of Cyclopropylacyl Radicals
作者:Markus R. Heinrich、Samir Z. Zard
DOI:10.1021/ol047892i
日期:2004.12.1
Cyclopropylacyl radicals derived from S-cyclopropylacyl xanthates (dithiocarbonates) undergo intermolecular additions to olefins without loss of CO or ring opening. In the presence of a phenyl ring on carbon C-1 of the cyclopropane ring, loss can be made to occur in the absence of an olefinic trap. The adducts from the cyclopropylacyl radical additions are easily converted into enones by base-induced beta-elimination of the xanthate group.
Simple synthesis of acetogenin transoid insect pheromones starting from acetylcyclopropane
作者:B. A. Cheskis、N. M. Ivanova、A. M. Moiseenkov、O. M. Nefedov
DOI:10.1007/bf00961235
日期:1991.7
A highly effective synthesis of a series of alkyl and 1-alkenyl cyclopropyl ketones, which are key components in the complete synthesis of a large number of transoid lepidoptera pheromones, has been developed, based on the alkylation of N-cyclohexyl-1-cyclopropylethylideneimine or its condensation with aldehydes.
CHESKIS, B. A.;IVANOVA, N. M.;MOISEENKOV, A. M.;NEFEDOV, O. M., IZV. AN CCCP. CEP. XIM.,(1990) N, S. 2025-2036
作者:CHESKIS, B. A.、IVANOVA, N. M.、MOISEENKOV, A. M.、NEFEDOV, O. M.
DOI:——
日期:——
CHESKIS, B. A.;IVANOVA, N. M.;MOISEENKOV, A. M.;NEFEDOV, O. M., IZV. AN CCCP. CEP. XIM.,(1991) N, S. 1555-1562
作者:CHESKIS, B. A.、IVANOVA, N. M.、MOISEENKOV, A. M.、NEFEDOV, O. M.