A Configurationally Stable Alkoxy Allenyl Zinc Reagent, en Route to anti-anti Vicinal Amino Diols
摘要:
[GRAPHICS]The reaction of an alkoxyallenyl zinc reagent with benzyl imines derived from lactic and mandelic acids proceeds highly diastereoselectively and leads to 2-amino-1,3-diol derivatives with an anti-anti pattern.
Diastereoconvergent Synthesis of trans-5-Hydroxy-6-Substituted-2-Piperidinones by Addition–Cyclization–Deprotection Process
摘要:
A diastereoselective one-pot approach to access trans-5-hydroxy-6-substituted-2-piperidinones by an addition-cyclization-deprotection process has been developed, in which the stereogenic center at the C-6 position was solely controlled by alpha-OTBS group. The utility of this transformation is demonstrated by the asymmetric synthesis of the enantiomer of (-)-CP-99,994.