Synthesis of 19-Fluororetinal and 20-Fluororetinal
摘要:
We have investigated methods to monofluorinate the methyl positions 19 and 20 in retinal, and we describe a general, mild strategy that proceeds in high yields and is compatible with current carbon-13 labeling strategies. The new sequence consists of the conversion of N-methoxy-N-methylamides via the alpha-chloromethyl ketone to the corresponding gamma-hydroxy nitrile, which can subsequently be fluorinated by (diethylamido)sulfur trifluoride (DAST).
Synthesis of 19-Fluororetinal and 20-Fluororetinal
作者:Michel Groesbeek、Steven O. Smith
DOI:10.1021/jo970162m
日期:1997.5.1
We have investigated methods to monofluorinate the methyl positions 19 and 20 in retinal, and we describe a general, mild strategy that proceeds in high yields and is compatible with current carbon-13 labeling strategies. The new sequence consists of the conversion of N-methoxy-N-methylamides via the alpha-chloromethyl ketone to the corresponding gamma-hydroxy nitrile, which can subsequently be fluorinated by (diethylamido)sulfur trifluoride (DAST).
A convenient and simple method for the .alpha.'-chlorination of .alpha.,.beta. and conjugated ketones