The present invention relates to new substituted hydroxyphenylamine based modulators of hormone and/or pigment levels, pharmaceutical compositions thereof, and methods of use thereof.
Optimized Synthesis of <scp>l</scp>-<i>m</i>-Tyrosine Suitable for Chemical Scale-Up
作者:Cara E. Humphrey、Markus Furegati、Kurt Laumen、Luigi La Vecchia、Thomas Leutert、J. Constanze D. Müller-Hartwieg、Markus Vögtle
DOI:10.1021/op700093y
日期:2007.11.1
This paper demonstrates how L-m-tyrosine 1 can be synthesized on larger-scale via enzyme-catalyzed kinetic resolution of N-acyl m-tyrosine methyl ester 4. N-Acyl m-tyrosine methyl ester 4 was prepared by a modification of Erlenmeyer's azalactone synthesis followed by hydrogenation of the resultant dehydroamino acid 12. The optimized four-step synthesis utilizes cheap and readily available starting materials and circumvents difficult purification protocols.