Abstract
A new synthetic strategy, which allows a complete stereochemical
control of all four chiral centers of two important polyhydroxylated
pyrrolidines 8 and 9 ,
is described. The cornerstone of the present strategy is a successful
implementation of the regioselective asymmetric aminohydroxylation
(RAA) reaction of the designed achiral olefin 1 and
the intramolecular stereoselective amidomercuration reaction of
the δ-alkenylamide 4 , which were used
for the introduction of the vicinal amino alcohol functionality and
for the construction of the five membered ring in the targets respectively.
Key words
carbohydrate - glycosidase inhibitor - polyhydroxylated pyrrolidine - regioselective
asymmetric aminohydroxylation reaction - intramolecular
amidomercuration reaction
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The NMR data of 8 and 9 are consistent with those in the literatures
(ref.
[12j ]
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[12m ]
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NMR (500 MHz, D2 O) δ 3.73-3.77 (m,
2 H), 3.80-3.86 (m, 4 H), 4.20 (d, 2 H, J = 2.0
Hz); 13 C NMR (125 MHz, D2 O) δ 61.17, 66.58,
78.36. For 9 , 1 H NMR
(500 MHz, D2 O) δ 1.27 (d, 3 H, J = 7.0
Hz), 3.75 (dd, 1 H, J = 7.5
Hz, 10.5 Hz), 3.77-3.87 (m, 3 H), 4.06 (d, 1 H, J = 3.5 Hz), 4.26 (d, 1 H, J = 3.5Hz).