challenging intramolecular hydroacyloxylation reaction. Both HFIP and an internal carboxy group have been proven to be crucial for the successful implementation of this transformation; these are proposed to assist the formation and stabilization of the key cationic intermediate via hydrogen-bondinginteractions with perrhenate anion (ReO4–).
该出版物描述了 Re 2 O 7在六氟异丙醇 (HFIP) 中的应用,用于活化惰性和电子失活的烯烃,以促进具有挑战性的分子内加氢酰氧基化反应。HFIP 和内部羧基均已被证明对于成功实施这一转变至关重要;这些被提议通过与高铼酸盐阴离子 (ReO 4 – )的氢键相互作用来帮助关键阳离子中间体的形成和稳定。
Aromatic ring synthesis by 1,3-michael-claisen annulation: Application to a trolox analogue and to precocene II
作者:Guy Soiladié、Dominique Boeffel、Jean Maignan
DOI:10.1016/0040-4020(95)01044-0
日期:1996.2
4-dihydro-2-ethoxycarbonyl-6-methoxy-7-hydroxy- benzopyran and Precocene II, were prepared from substituted α-methylene-δ- valerolactone and 1,1-bis-(methylthio)-2-propanone or butanone, via a 1,3-Michael- Claisen annulation.