Reactivity of cyclic sulfamidates towards sulfur-stabilised enolates. Stereocontrolled synthesis of functionalised lactams.
A structurally representative series of 1,2- and 1,3-cyclic sulfamidates react with enolates derived from methyl alpha-phenylthioacetate 9b to give 5- and 6-substituted alpha-phenylthio lactams 20-24. These products provide, via the corresponding sulfoxides, an entry to alpha,beta-unsaturated lactams e.g. 12, 27, 29 and their alpha-phenylthio analogues e.g. 26 and 30. With the enantiomerically pure 1,2-cyclic sulfamidates 10, 15 and 17, these reactions all proceed with no detectable loss of stereochemical integrity.
Bower
John F
JF
School of Chemistry, University of Bristol, Bristol, UK BS8 1TS.
Chakthong
Suda
S
Svenda
Jakub
J
Williams
Andrew J
AJ
Lawrence
Ron M
RM
Szeto
Peter
P
Gallagher
Timothy
T