Synthesis of α-fluoro-β, γ-alkenylphosphonates and conjugated fluoroenynes from a common intermediate (α-fluoropropargyl) phosphonate
摘要:
The efficient preparation of alpha-fluoro-beta,gamma-alkenylphosphonate 3, via catalytic hydrogenation of (alpha-fluoropropargyl)phosphonate ester 1, is described. Conjugated fluoroenynes 4 have been synthesized using a modified Horner Wadsworth Emmons (HWE) olefination of aldehydes or ketones and 1 in relatively good yields. Yields were lowered because of the formation of alpha-fluoro-gamma-hydroxyallenylphosphonate 5 during the reaction. The nature of the counterion was very important in the outcome of the HWE reaction; better yields of fluoroenynes were obtained when a potassium base was used instead of a lithium base. (C) 1998 Elsevier Science Ltd. All rights reserved.
Efficient Syntheses of (α-Fluoropropargyl)phosphonate Esters
作者:Farid Benayoud、Daniel J. deMendonca、Cheryl A. Digits、George A. Moniz、Tanya C. Sanders、Gerald B. Hammond
DOI:10.1021/jo9602027
日期:1996.1.1
Synthesis of α-fluoro-β, γ-alkenylphosphonates and conjugated fluoroenynes from a common intermediate (α-fluoropropargyl) phosphonate
作者:Farid Benayoud、Ling Chen、George A. Moniz、Antonio J. Zapata、Gerald B. Hammond
DOI:10.1016/s0040-4020(98)01017-5
日期:1998.12
The efficient preparation of alpha-fluoro-beta,gamma-alkenylphosphonate 3, via catalytic hydrogenation of (alpha-fluoropropargyl)phosphonate ester 1, is described. Conjugated fluoroenynes 4 have been synthesized using a modified Horner Wadsworth Emmons (HWE) olefination of aldehydes or ketones and 1 in relatively good yields. Yields were lowered because of the formation of alpha-fluoro-gamma-hydroxyallenylphosphonate 5 during the reaction. The nature of the counterion was very important in the outcome of the HWE reaction; better yields of fluoroenynes were obtained when a potassium base was used instead of a lithium base. (C) 1998 Elsevier Science Ltd. All rights reserved.