1659 1532 1239 749 702 compound 8b 1 69 g 3 84 mmols was obtained from 2 3 diacetoxy 2s 3s butanedioic acid 6 1 00 g 4 27 mmols and s u03b1 methylbenzylamine 1 25 g 10 3 mmols by the same procedure described for obtaining 20 with 90 yield as a white solid analytically pure samples may be obtained by recrystallization in acetone water pf 226 227 u00b0 c u03b1 d u2212 53 7 c 1 08 ch 2 cl 2 1 h rmn cdcl 3 200 mhz u03b47 25 m 5h 7 08 br s 1h 5 64 s 1h 4 99 m 1h 1 94 s 3h 1 42 d j 6 7 hz 3h 13 c rmn cdcl 3 50 mhz u03b4168 2 164 1 141 4 127 2 126 0 124 8 71 3 47 8 20 0 19 0 ir cm u2212 1 3255 3063 3029 2978 1755 1649 1544 1208 1055 756 698 compound 8c 1 69 g 3 84 mmols was obtained from 2 3 diacetoxy 2s 3s butanedioic acid 6 1 00 g 4 27 mmols and r u03b1 methylbenzylamine 1 25 g 10 3 mmols by the same procedure described for obtaining 20 with 90 yield as a white solid analytically pure samples may be obtained by recrystallization in acoet hexane pf 212 213.