o-Phosphono(alkyl)-N-sulfonyl-phenyl-alanine derivatives useful as intermediates for preparation of phosphono-hydroisoquinolines

A compound of the formula ##STR33## wherein each of R.sup.1 through R.sup.3 is independently selected from hydrido, alkyl, haloalkyl, halo, cyano, nitro and groups represented by --OR.sup.5, --SR.sup.5, ##STR34## wherein each R.sup.5 is independently selected from hydrido, alkyl, aryl and aralkyl;

• and wherein R.sup.6 is selected from alkyl, acyl, alkenyl, aryl, aralkyl, monocycloalkyl and polycycloalkyl, and wherein any one of the R.sup.6 substituents having a substitutable position may be substituted by one or more groups selected from alkyl, halo, haloalkyl, alkoxy, hydroxy, carboxy, amino, monoalkylamino, dialkylamino, cyano, oxo and ##STR35## and wherein each of Z.sup.1 and Z.sup.2 is independently selected from --OR.sup.5, SR.sup.5, ##STR36## wherein R.sup.5 defined as before;
• wherein W is a direct bond between the benzene ring and the phosphorus atom of Formula II, or W is selected from ##STR37## wherein each of R.sup.7 through R.sup.11 is independently selected from hydrido, lower alkyl, cyano, hydroxy, alkoxy, halo and cycloalkyl;
• wherein n is a number selected from zero, one and two;
• wherein R.sup.7 and R.sup.8 may be taken together to form oxo, with the proviso that when n is two, then only one oxo group may be formed;
• wherein each of R.sup.12 and R.sup.13 is independently selected from hydrido, lower alkyl, alkoxy, halo and cycloalkyl;
• and wherein X is selected from hydrido and groups represented by ##STR38## wherein R.sup.5 is defined as before.