Novel reactions of indium reagents with 1,2-diones: a facile synthesis of α-hydroxy ketones
作者:Vijay Nair、C.N Jayan、Sindu Ros
DOI:10.1016/s0040-4020(01)00937-1
日期:2001.11
Indium mediated reactions of allyl, cinnamyl, propargyl and benzyl bromides, ethyl bromoacetate and ethyl-4-bromocrotonate with 1,2-diones, in the presence of sodium iodide, occur efficiently to afford α-hydroxy keto compounds in excellent yields.
propargylation on corresponding keto-alcohols or by sodiumborohydride mediated reduction of 2-hydroxy-2-propargyl ketones. The furan synthesis proceeded through iodine mediated 5-exo-trig cyclization, dehydration and reductive deiodination. The method was applied to the synthesis of 2-methylfuran fused to phenanthrene, pyrene and acenaphthylene rings.