Synthesis of multifunctionalized building blocks via vinylogous addition of Chan’s diene to carbonyl and carbonyl-related electrophiles, mediated by molecular iodine
摘要:
The synthesis of multifunctionalized beta-ketoesters has been achieved by using molecular iodine as a catalyst under very mild conditions. The vinylogous addition of Chan's diene 1 to carbonyl and carbonyl-related compounds (aldehydes, ketones, imines and acetals) occurred with high efficiencies and with complete gamma-selectivity, giving a useful method for the synthesis of interesting libraries of different delta-functionalized beta-ketoesters. (C) 2011 Elsevier Ltd. All rights reserved.
A CONVENIENT METHOD FOR THE SYNTHESIS OF δ-ALKOXY-β-KETOESTER THE TITANIUM TETRACHLORIDE-ACTIVATED REACTION OF DIKETENE WITH ACETAL
作者:Toshio Izawa、Teruaki Mukaiyama
DOI:10.1246/cl.1974.1189
日期:1974.10.5
It was established that, in the presence of TiCl4, diketene [1] reacts with acetals [2] at −78∼−20°C to afford δ-alkoxy-β-ketoesters [3] in good yields. This reaction provides a novel method for the introduction of –COCH2COCH2– unit to an electrophile as acetal activated by TiCl4.