n benzyl o tert butyl n 2 z d serinamide after crystallization by diisopropylether yield 29 7 g hplc purity 99 33 ms 385 0 m 1 100 yield 91 u03b1 d 25 c 1 in dmf u2212 1 69 u00b0 1 h nmr dmso d 6 u03b41 09 s ch 3 bu t u03b43 49 m nhch 2 ph u03b44 13 m ch u03b44 25 dd j 5 6 hz chh u2032 obu t u03b44 35 dd j 6 0 hz chh u2032 obu t u03b45 03 s och 2 ph u03b47 18 7 35 m phhch 2 nh phhch 2 o and nhch u03b48 42 t nhch 2 ph 13 c nmr dmso d 6 627 1 c ch 3 3 u03b465 4 ch 2 o u03b441 9 nhch 2 ph u03b455 4 ch u03b472 6 c ch 3 3 u03b4 1 26 6 139 2 ph u03b4169 9 c o nh ir kbr 3333 1 3308 0 2974 3 1685 8 1651 1 1533 4 1469 8 1365 6 1294 2 1230 6 1037 7 696 3 cm u2212 1 10 palladium charcoal 1 g was charged to a solution n benzyl o tert butyl n 2 z d serinamide 5 g in methanol 50 ml subsequent stirring and.