Treatment of acetal-tethered (allenylmethyl)silanes, which were obtained from the corresponding 3-bromo-5-silyl-1,3-pentadienes by a Pd-catalyzed reaction with an acetal-tethered malonate, with TiCl4 gave not only vinylcyclohexene derivatives via a standard S(E)2' pathway but also unusual allenylcyclopentane species via cyclization at the delta-position. Deuterium-labeling experiments revealed participation of a 1,2-hydride shift in a carbocation intermediate for the formation of the latter products.
OZOE, YOSHIHISA;ETO, MORIFUSA, AGR. AND BIOL. CHEM., 1982, 46, N 2, 411-418
作者:OZOE, YOSHIHISA、ETO, MORIFUSA
DOI:——
日期:——
Verfahren zur Herstellung von Alkoxymethylenverbindungen von Essigestern und substituierten Essigestern
申请人:HÜLS AKTIENGESELLSCHAFT
公开号:EP0159599B1
公开(公告)日:1989-08-02
US4665218A
申请人:——
公开号:US4665218A
公开(公告)日:1987-05-12
Synthesis and some spectral characteristics of bicyclic phosphate, GABA antagonists.
作者:Yoshihisa OZOE、Morifusa ETO
DOI:10.1271/bbb1961.46.411
日期:——
Bicyclic phosphates (BPs), GABA antagonists, were prepared by reaction of the corresponding triols with phosphoryl chloride. The triols were obtained by one of the following methods: (a) the Tollens condensation of an aldehyde possessing α-hydrogen atoms with formaldehyde; (b) the basecatalyzed hydroxymethylation of alkylmalonates or α-alkylacetoacetates with paraformaldehyde, followed by reduction; (c) the reduction of diethyl pivaloylmalonate; or (d) the halogenation of pentaerythritol. Some BPs were also derived by modification of the functional groups of BP homologs. The 1H-NMR spectra of 4-substituted BPs showed a characteristic doublet peak due to the endocyclic methylene protons, the shift position of which was affected by the electronic nature of the bridgehead substituent. The mass spectra of the PBs were characterized by peaks due to the loss of CH2O from the ring.