Here is an interesting article where N-phenylalanine can be substituted on route to phenylacetone (P2P) or can be decarboxylated to amph then go further with a methylation to ----, I found it interesting perhaps it has been mentioned but it's new to me so I share...........java
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Degradation of a-Methyl-3,P-dihydroxyphenylalanine (a-MethylDOPA) H. L. SLATESD, . TAUBC, . H. Kuo, AND N. L. WENDLER Journal of Organic Chemistry Table of Contents Vol. 29,pg.1424-1429, No. 6: June 1964 http://rapidshare.de/files/4395881/jo01029a039.pdf.html
Abstract
a-MethylDOPA has been degraded in high yield by several pathways to derivatives of 3,4dihydroxyphenyl-
acetone. These degradations comprise recycle routes for the utilization of D-( +)-a-methylDOPA in the synthesis
of L-( - )-a-methylDOPA.
Dingo...brought to the attention that this topic has been discussed before at the HIve , and some of the relevant info is posted in Rhodium's Archive....