l-Threonine-catalysed asymmetric α-hydroxymethylation of cyclohexanone: application to the synthesis of pharmaceutical compounds and natural products
摘要:
L-Threonine has been found to be an efficient catalyst for the asymmetric alpha-hydroxymethylation of cyclohexanone with formalin. Reducing the amount of water in the reaction by the addition of magnesium sulfate as a dehydrating additive significantly improves the yield. Applications of (S)-2-hydroxymethyl cyclohexanone and the chiral building blocks derived therefrom for the synthesis of pharmaceutical compounds and natural products have been explored. (C) 2009 Elsevier Ltd. All rights reserved.
L-Threonine has been found to be an efficient catalyst for the asymmetric alpha-hydroxymethylation of cyclohexanone with formalin. Reducing the amount of water in the reaction by the addition of magnesium sulfate as a dehydrating additive significantly improves the yield. Applications of (S)-2-hydroxymethyl cyclohexanone and the chiral building blocks derived therefrom for the synthesis of pharmaceutical compounds and natural products have been explored. (C) 2009 Elsevier Ltd. All rights reserved.
Toward the Total Synthesis of Klaivanolide: Complete Reinterpretation of Its Originally Assigned Structure
Klaivanolide is an antiparasitic natural product isolated from Uvaria klaineana, whose structure was originally assigned as a seven-membered lactone ring. Attempts towards the total synthesis of klaivanolide led us to revise its original structural assignment based on both experimental evidence and spectroscopic data. The isolated compound was revealed to be a known molecule, acetylmelodorinol, originally