摘要:
Phenylthio acetals 3 are easily prepared from beta-hydroxy aldehydes and can be reduced to anti alkyllithiums 7 and subsequently equilibrated to syn alkyllithiums 9 with excellent stereoselectivity and in good overall yield. A practical preparation of 3 and a reductive lithiation procedure using catalytic naphthalene makes these alkyllithium reagents conveniently available on a multigram scale.