An unusual condensation of alkyl 3-oxo-4-(triphenylarsoranylidene)butanoate with aldehydes; synthesis of symmetrical substituted 1,3,5-cycloheptatrienes
作者:Cornelis M. Moorhoff
DOI:10.1016/s0040-4039(97)00809-5
日期:1997.6
The unique preparation of 2-substituted 4,7-dihydroxycyclohepta-3,5,7-triene-1,3-dicarboxylates 5 from aldehydes 4 and two equivalents alkyl 3-oxo-4-(triphenylarsoranylidene)butanoate 3 is described. (C) 1997 Elsevier Science Ltd.
Novel Michael-Wittig reactions of methyl 3-oxo-4-(triphenylarsoranylidene)butanoate and substituted 2H-pyran-5-carboxylates; The synthesis of highly functionalised 2-cyclohexenonedicarboxylates
作者:Cornelis M. Moorhoff
DOI:10.1016/s0040-4020(96)01126-x
日期:1997.2
Novel Michael-Wittig condensations of methyl 3-oxo-4-(triphenylarsoranylidene)-butanoate 6 and substituted 2,2-dimethyl-2H-pyran-5-carboxylates 5a to 5e gave substituted 4-alkyl-6-oxo-4-cyclohexene-1,3-dicarboxylates 8a to 8e in a mixture of three keto diastereomers and two enol diastereomers. Apart from substituted 4-alkyl-6-oxo-4-cyclohexene-1,3-dicarboxylates 8f to 8g, less hindered substituted 2-methyl-2H-pyran-5-carboxylates 5f and 5g gave the substituted tetrahydrobenzofurans 9f and 9g. 4-Halomethyl-6-oxo-4-cyclohexene 1,1-dicarboxylates 8 were mostly in the enol diastereomeric form. A plausible mechanism is given for the unique formation for these products. (C) 1997, Elsevier Science Ltd.
A General Method for the Rapid High Yield Preparation of Pure Arsonium Salts. Preparation Of (3-Alkoxy-Carbonyl-2-Oxopropyl)Triphenylarsonium Bromides
作者:Cornelis M. Moorhoff
DOI:10.1080/00397919808004872
日期:1998.8
Abstract An easy, rapid method for the preparation of arsonium salts of high yield and purity, by heating an alkyl halide and triphenylarsine as a melt at about 80°C, is described.