Highly Regio- and Stereoselective Copper(I) Chloride-Mediated Carbometallation of 2,3-Allenols with Grignard Reagents
作者:Zhan Lu、Shengming Ma
DOI:10.1002/adsc.200600532
日期:2007.5.7
An efficient highly regio- and stereoselective copper(I) chloride-mediated carbometallation of differently substituted 2,3-allenols with primary or secondary alkyl or aromatic Grignardreagents followed by iodination to synthesize fully-substituted allylic alcohols has been developed. This protocol introduces the R4 group from the Grignardreagent to the terminal position of the 2,3-allenols.
PdI2-Catalyzed Coupling–Cyclization Reactions Involving Two Different 2,3-Allenols: An Efficient Synthesis of 4-(1′,3′-Dien-2′-yl)-2,5-dihydrofuran Derivatives
作者:Youqian Deng、Jing Li、Shengming Ma
DOI:10.1002/chem.200800167
日期:2008.5.9
Transition-metal-catalyzed dimeric coupling-cyclizationreactions of twodifferent2,3-allenols afforded 4-(1',3'-dien-2'-yl)-2,5-dihydrofuranderivatives3. 2-Substituted 2,3-allenols1 cyclized to form the 2,5-dihydrofuran ring, whereas the 2-unsubstituted 2,3-allenols 2 provided the 1,3-diene unit at the 4-position. The reaction is proposed to proceed through an oxypalladation, insertion, and beta-hydroxide