Synthesis of allenes via thermal cycloreversion of .alpha.-alkylidene-.beta.-lactones
作者:Rick L. Danheiser、Yong Mi Choi、Maria Menichincheri、Eric J. Stoner
DOI:10.1021/jo00054a011
日期:1993.1
This paper describes the application of the solution-phase [2 + 2] cycloreversion of alpha-alkylidene-beta-lactones as a practical method for the generation of substituted allenes. Upon heating in dimethylformamide solution at 110-125-degrees-C, these unsaturated beta-lactone derivatives undergo decarboxylation to provide allenes in good to excellent yield. Alpha-alkylidene-beta-lactones are conveniently prepared via the phenylselenylation of beta-lactone enolates followed by oxidative elimination of the resulting alpha-phenylseleno derivatives. The beta-lactone starting materials are synthesized by the addition of thiol ester enolates to ketones and aldehydes according to our recently reported procedure.
BLACK, T. HOWARD;DUBAY, WILLIAM J. (III);TULLY, PAUL S., J. ORG. CHEM., 53,(1988) N 25, C. 5922-5927
作者:BLACK, T. HOWARD、DUBAY, WILLIAM J. (III)、TULLY, PAUL S.
DOI:——
日期:——
A new synthesis of substituted spiro butyrolactones via dyotropic rearrangement
作者:T.Howard Black、William J. DuBay
DOI:10.1016/s0040-4039(00)96625-5
日期:1987.1
Spiro butyrolactones bearing various α-substituents have been synthesized in three steps from acetic acid derivatives; the sequence employs a dyotropic rearrangement as its pivotal step.