The transformation of alkenes into γ-lactones using α-iodoesters
作者:George A. Kraus、Kevin Landgrebe
DOI:10.1016/0040-4039(84)80035-0
日期:——
Iodostannyl esters react with alkenes in the presence of AIBN to afford γ-lactones.
碘锡烷基酯在AIBN存在下与烯烃反应生成γ-内酯。
A new route to perhydro- and tetrahydro- furo-2,3b furans via radical cyclisation
作者:M. Pezechk、A.P. Brunetiere、J.Y. Lallemand
DOI:10.1016/s0040-4039(00)83861-7
日期:1986.1
Perhydrofuro-2,3b furans have been prepared in high yield by radicalcyclisation of unsaturated bromo acetals. Their transformation into tetrahydro derivatives is described along with a radical annelation to 2,3- dihydrofurans by tributyltin iodoacetate.
Regenerative γ-Lactone Annulations: A Modular, Iterative Approach to Oligo-tetrahydrofuran Molecular Stairs and Related Frameworks
作者:Showkat Rashid、Bilal A. Bhat、Goverdhan Mehta
DOI:10.1021/acs.orglett.5b01707
日期:2015.7.17
A unified, stereocontrolled, regenerative γ-butyrolactone annulation approach has been conceptualized and validated through syntheses of a range of oligo-THFs. The newprotocol is short (four steps), simple (table-top reagents), and efficient (50–61% overall yields). Although the scope of this approach is unlimited, it has been demonstrated up to five iterations on commercial γ-butyrolactone to assemble
(1R,5S)-2,8-Dioxabicyclo[3.3.0]octan-3-one and its derivatives, important subunits in various biologically active natural products, have been synthesized based on a new approach using the asymmetric oxyselenenylation of 2,3-dihydrofuran as the key step.
Diastereo- and enantioselective synthesis of 2,8-dioxabicyclo[3.3.0]octan-3-one derivatives
作者:Dieter Enders、Juan Vázquez、Gerhard Raabe
DOI:10.1039/a809611b
日期:——
An efficient asymmetric synthesis of 4-substituted (1S,4S,5R)-2,8-dioxabicyclo[3.3.0]octan-3-one derivatives (de 98%, ee = 80–>98%) in good overall yields is reported by a stepwise Michael addition–α-alkylation and subsequent hydrolytic domino reaction protocol employing formaldehyde SAMP-hydrazone as a neutral formyl anion equivalent and 5,6-dihydro-2H-pyran-2-one as a Michael acceptor.