- Reversal of the stereochemical course of the addition of phenylmagnesium bromide to N-benzylimines derived from R-glyceraldehyde depending on the O-protecting group and its application to the synthesis of both enantiomers of phenylglycine
-
The N-Benzyl imines derived from 2,3-di-O-benzyl-D-glyceraldehyde and 2,3-di-O-isopropylidene-D-glyceraldehyde reacted with phenylmagnesium bromide to afford fully protected aminodiols with total diastereoselectivity. The stereochemical course of the addition reaction depends on the nature of the O-protecting group. These compounds can be easily transformed to enantiomerically pure (R) and (S)α-phenylglycine.
- Badorrey, Ramon,Cativiela, Carlos,Diaz-De-Villegas, Maria D.,Galvez, Jose A.
-
-
Read Online
- Cysteine protease inhibitors
-
of the formula (IV): where: R1=R′C(O), R′SO2, R′=a bicyclic, saturated or unsaturated, 8-12 membered ring system containing 0-4 hetero atoms selected from S, O and N, which is optionally substituted with up to four substituents independently selected from groups a), b) and c) below; or R′=a monocyclic, saturated or unsaturated, 5-7 membered ring containing 0-3 hetero atoms selected from S, O and N, which monocyclic ring bears at least one substituent selected from group a) and/or c) and which may optionally bear one or two further substituents selected from group b); R4=H, C1-7-alkyl, Ar-C1-7-alkyl, Ar, C3-7-cycloalkyl; C2-7alkenyl; R3=C1-7-alkyl, C2-C7 alkenyl, C2-C7 alkenyl, C3-7-cycloalkyl, Ar-C1-7-alkyl, Ar; R5=C1-7-alkyl, halogen, Ar-C1-7-alkyl, C1-3-alkyl-CONR3R4 or a bulky amine R6 is H, C1-7-alkyl, Ar-C1-7-alkyl, C1-3-alkyl-SO2-Rix, C1-3-alkyl-C(O)—NHRix or CH2XAr q is 0 or 1 have utility as inhibitors of cysteine proteases such as cathepsin K and falcipain.
- -
-
-