A synthesis of an allylic spiro-lactone (1) is described. Compound 1 is obtained in 5 steps from dimedone with an overall yield of 8.8%. The main feature of the synthesis is the transformation of compound 3 in 1, which involves an water elimination accompanied by allylic rearrangement and lactonization.
An improved procedure for the synthesis of allylic spiro-γ-lactones
作者:Jagattaran Das、Prabir K. Choudhury、Srinivasan Chandrasekaran
DOI:10.1016/0040-4020(95)00067-i
日期:1995.3
Allylic spiro-γ-lactones of the type 4 have been synthesised in two steps starting from the carbonyl precursors using heterogeneous permanganate oxidation as the key step.
A Convenient Synthesis of 7,9,9-Trimethyl-1-oxaspiro[4,5]-6-decen-2-one
作者:Drury Caine、Chia-Rong Lin
DOI:10.1080/00397919408010555
日期:1994.9
The allylic lactone 1 was prepared from the reaction of lithium 3-lithiopropanoate (5) with isophorone (3) followed by mild acid treatment of the hydroxy acid adduct.
Caine Drury, Lin Chia-Rong, Synth. Commun, 24 (1994) N 17, S 2473- 2476