Treatment of 3,4-epoxy-1-butene with CgF13I, PhSH, or Ph3GeH in the presence of Et3B provides 4-substituted-2-buten-1-ol in good yield. Et3B–Ph3SnH mediated intramolecular alkylation of 1,3-diene monoxide are also described.
Allylation Reactions of Aldehydes with Allylboronates in Aqueous Media: Unique Reactivity and Selectivity that are Only Observed in the Presence of Water
Zn(OH)2‐catalyzed allylation reactions of aldehydes with allylboronates in aqueous media have been developed. In contrast to conventional allylboration reactions of aldehydes in organic solvents, the α‐addition products were obtained exclusively. A catalytic cycle in which the allylzinc species was generated through a B‐to‐Zn exchange process is proposed and kinetic studies were performed. The key
Regio- and stereoselective samarium diiodide-promoted intermolecular coupling between vinyloxiranes and ketones. Synthesis of 2-alken-1,5-diols
作者:José M. Aurrecoechea、Elena Iztueta
DOI:10.1016/0040-4039(95)01416-f
日期:1995.9
temperatures in the presence of ketones results in the efficient formation of 2-alken-1,5-diols with predominant or exclusive (E) configuration. In the absence of HMPA higher temperatures are needed for the coupling and the regioisomeric 1,3-diols are also obtained.