Patent ID: 6919461

Claim:
A compound having the formula wherein PG is (trimethyl silyl) ethoxy methyl (SEM), p-methoxybenzyl (PMB), benzyloxycarbonyl (CBZ), tert-butoxycarbonyl (BOC), tetra hydropyranyl (THP), or fluorine-9-methyloxycarbonyl (FMOC); T is halo, NO 2 , substituted boron, or unsubstituted or substituted amino; and T′ is CHO, CO 2 R 3 , or CONR 3 R 3 ; wherein R 3 is a substituted or unsubstituted alkyl, alkenyl, aryl, carbocycle, hydroxy, halogen, alkoxy, aryloxy, thioalkyl, thioaryl, thioacyl, or amino.