Tetrahedron Letters p. 1471 - 1474 (1983)
Update date:2022-08-04
Topics:
Sugiyama, Yuichi
Wedler, Frederick C.
The diastereomers of L-methionine-S,R-sulfoximine, blocked at α-N with phthaloyl, then cyclized with Ac2O to form 3,4,5,6-tetrahydro-1-methyl-3-oxo-4-(N-phthalimido)-1,2-thiazine-1-oxide, could be easily separated by fractional crystallization or HPLC, whereas the parent compounds were very difficult to separate.
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