A highly stereo- and regio-selective radical cyclisation of homoallylicxanthate esters is presented and the reaction is applied to the synthesis of some ring fused lactones.
提出了高烯丙基黄原酸酯的高度立体和区域选择性自由基环化反应,并将该反应用于某些环稠合内酯的合成。
YAMAMOTO, MAKOTO;URUMA, TAKASHI;IWASA, SEIJI;KOHMOTO, SHIGEO;YAMADA, KAZU+, J. CHEM. SOC. CHEM. COMMUN.,(1989) N7, C. 1265-1267
Facile Reduction of Dithiocarbonates Derived from Secondary Alcohols with<i>n</i>-Bu<sub>3</sub>SnH–Et<sub>3</sub>B and Synthesis of 2-Furanthiones and 2-Furanones by Intramolecular Addition of Alkoxythiocarbonyl Free Radicals to Acetylenic Linkages
作者:Kyoko Nozaki、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1246/bcsj.63.2578
日期:1990.9
reduction of dithiocarbonates or thiocarbonates by n-Bu3SnH–Et3B easily gives the corresponding hydrocarbons. The intermediate alkoxythiocarbonyl radical equivalents are trapped by properly located carbon–carbon multiple bonds. The dithiocarbonates derived from either homopropargylic or homoallylic alcohols produce tetrahydrofuranones upon treatment with n-Bu3SnH–Et3B. Application of this new method