Synthesis of novel chiral quaternary phosphonium fluorides: reagents for simple asymmetric nucleophilic fluorination reactions
摘要:
The novel chiral quaternary salt (R-P)-benzylmenthylmethylphenylphosphonium fluoride was synthesised. The compound was used in the asymmetric nucleophilic fluorination of 2-bromopropiophenone to give 7-fluoropropiophenone in a 35% yield with [alpha](D)(20) = +1.94 degrees. (C) 2001 Elsevier Science B.V. All rights reserved.
VALENTINE D. JR.; BLOUNT J. F.; TOTH K., J. ORG. CHEM., 1980, 45, NO 18, 3691-3698
作者:VALENTINE D. JR.、 BLOUNT J. F.、 TOTH K.
DOI:——
日期:——
Crystallization-Induced Asymmetric Transformation of a Tertiary Phosphine
作者:Edwin Vedejs、Yariv Donde
DOI:10.1021/jo991493x
日期:2000.4.1
An equilibrating diastereomer mixture of the tertiary phosphines 5 and 6 (2.5:1 equilibrium ratio) undergoes crystallization-induced asymmetric transformation upon slow evaporation of solvent from refluxing heptane to give a 20:1 ratio in favor of the more stable crystalline isomer 5. The process can also be carried out at room temperature by using iodine to catalyze the interconversion of 5 and 6
Synthesis of novel chiral quaternary phosphonium fluorides: reagents for simple asymmetric nucleophilic fluorination reactions
作者:Andrew J. Beaumont、Christopher Kiely、A. Denise Rooney
DOI:10.1016/s0022-1139(00)00401-2
日期:2001.3
The novel chiral quaternary salt (R-P)-benzylmenthylmethylphenylphosphonium fluoride was synthesised. The compound was used in the asymmetric nucleophilic fluorination of 2-bromopropiophenone to give 7-fluoropropiophenone in a 35% yield with [alpha](D)(20) = +1.94 degrees. (C) 2001 Elsevier Science B.V. All rights reserved.