General synthesis of cyclopropenones and their acetals
作者:Masahiko Isaka、Satoshi Ejiri、Eiichi Nakamura
DOI:10.1016/s0040-4020(01)88873-6
日期:——
Metalated cyclopropenone acetals 5 react with a variety of electrophiles, including alkyl halides, carbonylcompounds, vinyl iodides, vinyl triflates, and aryl iodides, to give substituted cyclopropenone acetals in high yield. Hydrolysis of the acetal under acidic conditions gives the corresponding cyclopropenone. The reaction sequence has realized an efficient synthesis of an antibiotic penitricin
A variety of substituted cyclopropenone ketals have been prepared by electrophilic trapping (protonolysis and alkylation) of sodium salts of cyclopropenone ketals that have been generated directly from the ketals of 1,3-dichloroacetone derivatives through cyclization with NaNH2 in a liq. NH3/ether mixture.
[EN] A NOVEL PROCESS FOR THE PREPARATION OF 3-THIETANOL<br/>[FR] NOUVEAU PROCÉDÉ DE PRÉPARATION DE 3-THIÉTANOL
申请人:[en]PI INDUSTRIES LTD.
公开号:WO2022234528A1
公开(公告)日:2022-11-10
The present invention discloses a simple, efficient and cost effective process for the synthesis of 3-thietanol.
Practical Preparation of Cyclopropenone 1,3-Propanediol Ketal
作者:Florian F. Mulks、Robin Heckershoff、Marc Zimmer、A. Stephen K. Hashmi
DOI:10.1055/s-0039-1690830
日期:2020.4
an increasingly versatile building block for the introduction of various C3 and dioxaspiro units due to the emergence of numerous methodologies for the application of strained hydrocarbons. This Practical Synthetic Procedure gives an updated synthesis for a basic ketal of cyclopropenone with lowered solvent toxicity and a detailed step-by-step guide for the safe production of potassium amide in liquid