Cyclopropanization of Methyl Carboxylates withTebbe-Type Reagents
作者:Reza-Ali Fallahpour、Hans-J�rgen Hansen
DOI:10.1002/hlca.19940770817
日期:1994.12.14
methylenation reaction of methyl azulene-2-carboxylates (cf. Schemes 1 and 2) with Tebbe's or Takai's reagent is described. When the prescribed amount of Takai's reagent is applied in a four-fold excess, the corresponding cyclopropyl methyl ethers are formed instead of the enolethers (cf. Schemes 2 and 3). Similarly, methyl benzoate and methyl 2-naphthoate yield, after treatment with Takai's reagent and hydrolysis